feat: nahual standalone — visores open-with sobre Llimphi (front-door, git-dep al monorepo)

Stack de visores extraído como front-door limpio: solo los crates nahual-*
(shell open-with + ~14 visores: texto/imagen/audio/video/svg/mapa/fuente/hex/
tabla/markdown/archivo/card/gallery/árbol + cores + meta-runtime). Todo lo
fundacional (discern, decoders media, fuentes content-addressed, hojas shared)
y Llimphi se consumen por git-dep del monorepo gioser.git — cero vendoring.
cargo check --workspace pasa (0 errores).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

f63e78141d856d65edfc06c793a3e00a7eff7bfe · by Sergio · 2026-06-04T11:32:14Z (4 months ago) · browse the tree at this commit

Semantic delta · 1062

02_ruway/nahual/libs/meta-runtime/src/lib.rs

new mod backend pub
new mod csv pub
new mod delta pub
new mod format pub
new mod metric pub
new mod parse pub
new mod refs pub
new mod testing pub

02_ruway/nahual/libs/meta-runtime/src/metric.rs

new enum MetricResult pub
new def OTROS_LABEL pub
new fn avg_by_is_per_group_mean
new fn avg_empty_is_zero_not_nan
new fn avg_min_max_over_numeric
new fn breakdown_csv_roundtrip
new fn breakdown_to_csv pub
new fn bucket_date pub
new fn bucket_date_truncates_iso
new fn cmp_text
new fn compute_metric pub
new fn count_all_and_filtered
new fn count_distinct_counts_unique_non_empty_values
new fn cumulative_breakdown pub
new fn cumulative_breakdown_running_total
new fn date_range_is_lexicographic
new fn field_as_text
new fn filt
new fn filter_passes
new fn group_by_counts_and_ranks_by_frequency
new fn grouped_aggregate
new fn limit_breakdown pub
new fn limit_breakdown_avg_bucket_is_mean_not_sum
new fn limit_breakdown_counts_sums_the_tail
new fn limit_breakdown_noop_when_within_limit
new fn multi_breakdown_csv_is_a_matrix
new fn non_empty_filter
new fn numeric_range_filters
new fn record_matches pub
new fn recs
new fn series_aggregate
new fn sort_breakdown_by_key pub
new fn sort_breakdown_by_key_is_chronological_for_iso
new fn sort_multi_breakdown_permutes_series
new fn sum_by_aggregates_and_ranks_by_value
new fn sum_by_series_builds_aligned_matrix
new fn sum_skips_missing_and_non_numeric
new mod tests

02_ruway/nahual/libs/meta-runtime/src/parse.rs

new fn infer_handles_basic_types
new fn infer_param_value pub
new fn parse_boolean_recognizes_variants
new fn parse_entity_ref_accepts_valid_uuid
new fn parse_entity_ref_rejects_empty_string
new fn parse_entity_ref_rejects_non_uuid
new fn parse_entity_ref_trims_whitespace
new fn parse_field_value pub
new fn parse_number_i64_or_f64
new fn parse_select_and_auto_id_passthrough
new fn parse_text_passthrough
new fn resolve_param_no_spec_falls_back_to_infer
new fn resolve_param_optional_empty_returns_null
new fn resolve_param_required_empty_rejected
new fn resolve_param_strict_boolean_rejects_non_boolean
new fn resolve_param_strict_entity_ref_propagates_error
new fn resolve_param_strict_number_parses_i64
new fn resolve_param_value pub
new fn spec
new mod tests

02_ruway/nahual/libs/meta-runtime/src/refs.rs

new fn distinguishes_target_from_other_entities
new fn empty_list_is_ok
new fn fails_on_first_missing
new fn mk_load
new fn passes_when_all_records_exist
new mod tests
new fn uses_label_not_entity_in_msg
new fn validate_entity_refs pub

02_ruway/nahual/libs/meta-runtime/src/testing.rs

new struct MockBackend pub
new type MorphismHandler
new fn default
new fn delete
new fn delete_then_load_returns_none
new fn list_records
new fn list_records_orders_lexicographically
new fn load_record
new fn map_of
new fn morphism
new fn morphism_without_handler_errors_clearly
new fn new pub
new fn records_for pub
new fn records_for_returns_borrowed_view
new fn seed
new fn seed_then_load_round_trip_via_trait
new mod tests
new fn total_records pub
new fn update
new fn update_no_op_returns_no_change
new fn update_set_and_clear_aplica_ambos
new fn with_morphism pub
new fn with_morphism_lets_caller_simulate_logic
new fn with_records pub
new fn with_records_populates_state

02_ruway/nahual/libs/meta-schema/src/lib.rs

new enum Action pub
new struct CardFilter pub
new enum ChartKind pub
new struct Column pub
new struct DashboardCard pub
new struct DashboardView pub
new enum DateBucket pub
new struct DetailMetric pub
new struct DetailView pub
new struct EntitySpec pub
new enum FieldKind pub
new struct FieldSpec pub
new enum FilterOp pub
new struct FormView pub
new struct GraphView pub
new struct ListView pub
new struct MenuItem pub
new enum Metric pub
new struct Module pub
new struct RelatedList pub
new struct ReportToggle pub
new struct ReportView pub
new enum SchemaError pub
new struct SelectOption pub
new enum ValueFormat pub
new enum View pub
new fn chart_kind_defaults_to_bars_and_parses
new fn default_weight
new fn display pub
new fn entity_ref_with_target_validates_clean
new fn from_path pub
new fn from_path_loads_real_file
new fn load_modules_detects_duplicate_id
new fn load_modules_from_dir pub
new fn load_modules_from_dir_finds_subdirs
new fn module_serialize_deserialize_roundtrip
new fn sample_module
new fn select_option_display_falls_back_to_value
new fn select_with_options_validates_clean
new fn select_without_options_is_rejected
new mod tests
new fn validate pub
new fn validate_catches_dangling_menu_view
new fn validate_catches_entity_ref_without_target
new fn validate_passes_for_well_formed_module

02_ruway/nahual/libs/meta-schema/tests/example_modules.rs

new fn every_demo_form_field_kind_is_recognized
new fn every_demo_module_has_list_and_form_views
new fn every_module_validates_clean
new fn examples_dir
new fn loads_demo_modules
new fn ventas_has_dashboard_and_report_views

02_ruway/nahual/nahual-archive-viewer-llimphi/src/lib.rs

new struct ArchiveViewerPalette pub
new fn archive_viewer_view pub
new fn default
new fn from_theme pub

02_ruway/nahual/nahual-audio-viewer-llimphi/examples/audio_viewer_demo.rs

new struct Model
new type Model
new enum Msg
new type Msg
new struct Showcase
new def TICK
new fn init
new fn initial_size
new fn main
new fn on_key
new fn title
new fn update
new fn view

02_ruway/nahual/nahual-audio-viewer-llimphi/src/lib.rs

new struct AudioViewerPalette pub
new struct AudioViewerState pub
new struct DecodedAudio
new def PROBE_CAPACITY
new def SPECTRUM_BANDS
new def SPECTRUM_FMAX
new def SPECTRUM_FMIN
new fn audio_viewer_view pub
new macro build
new fn decode
new fn default
new fn default
new fn duration pub
new fn estado_default_sin_audio
new fn fmt_time
new fn fmt_time_basico
new fn formato_desconocido_es_error
new fn from_theme pub
new fn is_playing pub
new fn lerp_color
new fn magnitudes pub
new fn open pub
new fn open_inexistente_es_error
new fn placeholder_body
new fn position pub
new fn spectrum_body
new mod tests
new fn tick pub
new fn toggle_play pub

02_ruway/nahual/nahual-card-viewer-llimphi/src/lib.rs

new struct CardViewerPalette pub
new fn card_viewer_view pub
new fn default
new fn from_theme pub

02_ruway/nahual/nahual-file-explorer-llimphi/src/lib.rs

new def DEFAULT_ROW_HEIGHT pub
new def DEFAULT_VISIBLE_ROWS pub
new struct Entry pub
new struct FileExplorerState pub
new enum OpenedFile pub
new def WHEEL_LINES_PER_ROW pub
new fn apply_wheel pub
new fn down pub
new fn file_explorer_view pub
new fn new pub
new fn open_selected pub
new fn parent pub
new fn scan_dir pub
new fn scroll pub
new fn select pub
new fn selected_entry pub
new fn selected_path pub
new fn sync_offset
new fn up pub

02_ruway/nahual/nahual-font-viewer-llimphi/src/lib.rs

new def DEFAULT_FONT_BYTES_MAX pub
new struct FontInfo pub
new enum FontPreview pub
new struct FontViewerPalette pub
new struct OutlineToPath
new def SAMPLE_LINES
new struct SampleLine pub
new fn basura_no_es_fuente
new fn build_info
new fn build_line
new fn close
new fn curve_to
new fn default
new fn font_viewer_view pub
new fn from_theme pub
new fn inexistente_es_error
new fn info_line
new fn line_to
new fn load_font pub
new fn move_to
new fn outline_builder_construye_path
new fn pad
new fn pick_name
new fn quad_to
new fn sample_canvas
new mod tests

02_ruway/nahual/nahual-gallery-llimphi/src/main.rs

new def BREADCRUMB_H
new def CAP_THUMBS
new def EXTS
new enum Entrada
new struct Gallery
new def HEADER_H
new def LABEL_H
new def MAX_EN_VUELO
new def MAX_PREVIEW_BYTES
new struct Model
new type Model
new enum Msg
new type Msg
new enum Orden
new def SLIDE_SECS
new def THUMB_LADO
new def TILE_MAX
new def TILE_MIN
new def U
new fn abrir_preview
new fn ancestros
new fn app_menu
new fn asegurar_visible
new fn avanzar_imagen
new fn barra_ruta
new fn bombear
new fn celda_contenido
new fn encabezado
new fn es_carpeta
new fn es_imagen
new fn etiqueta
new fn handle_menu_command
new fn humano
new fn init
new fn initial_size
new fn listar
new fn main
new fn manejar_tecla
new fn menubar_spec
new fn navegar_a
new fn nombre
new fn on_key
new fn on_wheel
new fn ordenar_paths
new fn path
new fn programar_slide
new fn siguiente
new fn title
new fn update
new fn view
new fn view_overlay
new fn viewport_of

02_ruway/nahual/nahual-geo-core/src/lib.rs

new struct AStarNode
new struct BBox pub
new struct Basemap pub
new def CACHE_CAP
new struct CacheEntry
new type Coord pub
new def DEFAULT_MAP_BYTES_MAX pub
new struct FeatureProps pub
new enum Geom
new struct Label pub
new def MAX_LABELS
new def MAX_PROPS
new def MAX_TILES
new def MAX_VERTICES
new struct MapData pub
new enum MapPreview pub
new struct MapView pub
new enum NameTarget
new def PMTILES_MAGIC
new struct Projection pub
new def R
new type Ring pub
new struct RouteResult pub
new def SRC
new def WORLD
new def WORLD
new def ZOOM_MAX pub
new def ZOOM_MIN pub
new fn altitud_se_ignora
new fn append
new fn base pub
new fn basemap_viewport_funde_tiles_visibles
new fn bbox pub
new fn bbox_correcta
new fn cache_len pub
new fn centroid
new fn clear_route pub
new fn cmp
new fn collect
new fn contains pub
new fn contains_usa_el_rect_registrado
new fn coord
new fn coord_list
new fn coord_rings
new fn coordenadas_no_finitas_se_filtran
new fn data_of
new fn default
new fn dist_point_seg
new fn empty
new fn eq
new fn etiqueta_de_poligono_en_el_centroide
new fn etiquetas_desde_properties
new fn evict_lru
new fn evict_lru_saca_los_mas_viejos
new fn expand
new fn feature_bbox
new fn feature_collection_mixta
new fn feature_name
new fn feature_props
new fn feature_props_retiene_propiedades
new fn fit pub
new fn focus_on pub
new fn focus_on_centra_y_selecciona
new fn fold
new fn gpx_data
new fn gpx_latlon
new fn gpx_ruta_es_linea
new fn gpx_vacio_es_no_geometry
new fn gpx_waypoint_self_closing_sin_nombre
new fn gpx_waypoints_y_track
new fn haversine
new fn haversine_distancia_conocida
new fn hit_test pub
new fn hit_test_selecciona_feature_bajo_el_clic
new fn inexistente_es_error
new fn intern_node
new fn inverse pub
new fn is_empty
new fn json_invalido_es_error
new fn json_sin_geometria_es_no_geometry
new fn kml_coords
new fn kml_coords_ignora_altitud_y_espacios
new fn kml_data
new fn kml_point_line_polygon
new fn label_at
new fn linea_de_un_punto_se_descarta
new fn linestring
new fn load_map pub
new fn load_map_desambigua_gpx_de_geojson
new fn load_map_desambigua_kml
new fn load_pmtiles_overview pub
new fn make_feature
new fn mapa_base_mundial_carga_completo
new fn match_score
new fn midpoint
new fn multipolygon_y_multipoint
new fn mvt_tile_a_mapdata
new fn mvt_tile_to_mapdata pub
new fn nearest_node
new fn number pub
new fn numeric_fields pub
new fn numeric_fields_distintos_en_orden
new fn open pub
new fn overview_zoom
new fn pan_acumula_y_reset_vuelve_al_origen
new fn pan_by pub
new fn parse_geojson pub
new fn parse_gpx pub
new fn parse_into
new fn parse_kml pub
new fn partial_cmp
new mod pmtiles pub
new fn pmtiles_extent
new fn pmtiles_extent_deriva_de_geometria_con_header_roto
new fn pmtiles_overview_end_to_end
new fn point_in_ring_screen
new fn polygon_con_hueco
new fn punto_suelto
new fn push_line
new fn push_points
new fn push_polygon
new fn record_rect pub
new fn rect pub
new fn reset pub
new fn route pub
new fn route_sin_lineas_no_hay_ruta
new fn route_snapea_al_nodo_mas_cercano
new fn route_sobre_cuadricula
new fn search pub
new fn search_rankea_nombre_sobre_props
new mod tests
new fn tiny_pmtiles
new fn to_screen pub
new fn toggle_base pub
new fn toggle_base_alterna
new fn total_features pub
new fn unproject pub
new fn varint
new fn varint
new fn varint
new fn vertex_count pub
new fn vertice_count_y_truncado
new fn viewport pub
new mod vt pub
new fn world_base pub
new fn world_base_stats pub
new fn zoom_at pub
new fn zoom_at_ancla_el_punto_bajo_el_cursor
new fn zoom_at_sin_rect_cae_a_zoom_al_centro
new fn zoom_by pub
new fn zoom_se_acota

02_ruway/nahual/nahual-geo-core/src/pmtiles.rs

new struct Entry
new def HEADER_LEN
new struct Header pub
new def MAGIC
new struct PmTiles pub
new struct VarintReader
new fn build_pmtiles
new fn decompress
new fn find_entry
new fn from_bytes pub
new fn gzip_de_directorio
new fn hilbert_valores_conocidos
new fn hilbert_xy2d
new fn i32le
new fn magic_invalido_falla
new fn new
new fn open pub
new fn parse_directory
new fn read
new fn read_dir
new fn roundtrip_lee_el_tile
new mod tests
new fn tile pub
new fn tile_id_acumula_zooms
new fn u64le
new fn varint
new fn write_dir
new fn zxy_to_tile_id pub

02_ruway/nahual/nahual-geo-core/src/vt.rs

new def CMD_CLOSE_PATH
new def CMD_LINE_TO
new def CMD_MOVE_TO
new struct Pbf
new struct TileFeature pub
new enum TileGeom pub
new fn basura_no_panica
new fn decode_feature
new fn decode_geometry
new fn decode_layer
new fn decode_mvt_tile pub
new fn decodifica_linestring
new fn decodifica_multipoint
new fn decodifica_polygon_cerrado
new fn eof
new fn flush
new fn len_delim
new fn len_delim
new fn lonlat_a_tile_y_zoom
new fn lonlat_to_tile pub
new fn mercator_esquinas_conocidas
new fn new
new fn skip
new fn tag
new fn tag
new mod tests
new fn tile_to_lonlat pub
new fn varint
new fn varint
new fn zigzag
new fn zigzag_decodifica
new fn zoom_for_span pub
new fn zz

02_ruway/nahual/nahual-hex-viewer-llimphi/src/lib.rs

new struct HexViewerPalette pub
new fn default
new fn from_theme pub
new fn hex_viewer_view pub

02_ruway/nahual/nahual-image-viewer-llimphi/examples/image_viewer_demo.rs

new struct Model
new type Model
new enum Msg
new type Msg
new def PROC_H
new def PROC_W
new struct Showcase
new fn init
new fn initial_size
new fn main
new fn procedural_state
new fn title
new fn update
new fn view

02_ruway/nahual/nahual-image-viewer-llimphi/src/lib.rs

new def DEFAULT_IMAGE_BYTES_MAX pub
new enum ImagePreviewState pub
new struct ImageViewerPalette pub
new fn default
new fn default
new fn from_theme pub
new fn image_body
new fn image_viewer_view pub
new fn load_image pub
new fn placeholder_body

02_ruway/nahual/nahual-map-viewer-llimphi/examples/probar.rs

new fn main
new fn streaming_demo

02_ruway/nahual/nahual-map-viewer-llimphi/src/lib.rs

new struct MapViewerPalette pub
new def PANEL_ROWS
new fn clip_text
new fn default
new fn draw_legend
new fn draw_props_panel
new fn fmt_coordenadas_con_hemisferio
new fn fmt_deg
new fn fmt_deg_decimales_segun_paso
new fn fmt_distance
new fn fmt_distancia_km_y_m
new fn fmt_lat
new fn fmt_lon
new fn fmt_num
new fn from_theme pub
new fn map_canvas
new fn map_viewer_view pub
new fn nice_125
new fn nice_125_redondea
new fn nice_step
new fn nice_step_es_redondo
new fn pad
new fn ring_path
new fn scale_color
new fn scale_color_extremos_y_medio
new fn simple_body
new mod tests
new fn ticks
new fn ticks_dentro_del_rango
new fn with_alpha

02_ruway/nahual/nahual-markdown-viewer-llimphi/src/lib.rs

new struct MarkdownViewerPalette pub
new fn block_style
new fn block_view
new fn default
new fn from_theme pub
new fn heading_size
new fn markdown_viewer_view pub
new fn pad
new fn simple_body

02_ruway/nahual/nahual-shell-llimphi/src/main.rs

new enum Accion
new def DISCERN_SAMPLE_BYTES
new def FRAME_TICK
new struct Model
new type Model
new enum Msg
new type Msg
new enum PreviewPane
new def RESTREAM_THROTTLE
new struct Shell
new fn abrir_en_fuente
new fn app_menu
new fn clear_preview
new fn context_menu_spec
new fn etiqueta_seleccion
new fn handle_menu_command
new fn hay_seleccion
new fn header_bar
new fn init
new fn initial_size
new fn launch_puriy
new fn load_for
new fn main
new fn menubar_spec
new fn navigator_list_view
new fn next_in_cycle
new fn on_key
new fn on_wheel
new fn open_basemap_if_pmtiles
new fn open_video
new fn parece_repo_minga
new fn preview_from_bytes
new fn read_header_sample
new fn refresh_preview
new fn refresh_preview_nav
new fn restream_basemap
new fn sanitizar_nombre
new fn target_dir
new fn title
new fn try_mount
new fn update
new fn view
new fn view_overlay
new mod viewer_registry
new fn viewport_of

02_ruway/nahual/nahual-shell-llimphi/src/viewer_registry.rs

new def REGISTRY
new def SCORE_LENS
new def SCORE_MIME_EXACT
new def SCORE_MIME_PREFIX
new def SCORE_NONE
new struct ViewerCard pub
new enum ViewerKind pub
new fn as_tag pub
new fn audio_lens_y_mime_van_a_audio
new fn binarios_van_a_hex
new fn builtin
new fn builtin_registry pub
new fn cada_kind_built_in_es_alcanzable_por_su_lens
new fn card_con_tag_desconocido_no_mapea
new fn card_descubierta_extiende_ruteo_de_visor_montado
new fn card_descubierta_gana_empate_por_orden
new fn card_lens_va_a_card
new fn card_mapea_lens_mime_y_priority
new fn card_sin_tag_no_mapea
new fn code_va_a_texto
new fn comprimidos_van_a_archive
new fn directorio_de_ejemplo_carga_y_rutea
new fn disc
new fn discover_in
new fn discover_viewer_cards pub
new fn emite_ejemplo_json
new fn external_handler_for pub
new fn external_handler_for_matchea_por_mime
new fn font_lens_va_a_font
new fn from_tag pub
new fn gallery_lens_va_a_imagen
new fn gif_va_a_video_aunque_sea_gallery
new fn html_va_a_web
new fn json_str_array
new fn lens_gana_sobre_mime_prefijo
new fn map_lens_y_mime_van_a_mapa
new fn markdown_va_a_markdown
new fn mime_image_sin_lens_va_a_imagen
new fn mime_video_sin_lens_va_a_video
new fn pick pub
new fn pick_builtin
new fn pick_in
new fn registry pub
new fn score
new fn sin_discernimiento_cae_a_texto
new fn table_lens_va_a_table
new fn tag_round_trip
new mod tests
new fn tree_lens_va_a_tree
new fn video_lens_va_a_video
new fn viewer_card
new fn viewer_card_from_card pub
new fn viewers_dir

02_ruway/nahual/nahual-source-core/src/lib.rs

new struct Node pub
new type NodeId pub
new trait Source pub
new def from_hex
new fn from_hex_rechaza_basura
new fn hex_round_trip
new mod minga pub
new mod navigator pub
new fn new pub
new mod nouser pub
new mod posix pub
new mod tests
new def to_hex
new mod wawa pub

02_ruway/nahual/nahual-source-core/src/minga.rs

new struct MingaSource pub
new def RAIZ
new fn abrir pub
new fn children
new fn id_basura_es_error
new fn label
new fn navega_dag_de_ast_y_lee_hoja
new fn nodo
new fn nodo_de
new fn parse_id
new fn read
new fn repo_con_ast
new fn repo_vacio_lista_cero_nodos
new fn root
new mod tests

02_ruway/nahual/nahual-source-core/src/navigator.rs

new def DEFAULT_VISIBLE_ROWS pub
new struct Navigator pub
new enum Opened pub
new fn apply_wheel pub
new fn arbol
new fn at_root pub
new fn breadcrumb pub
new fn children pub
new fn desciende_lee_y_sube
new fn down pub
new fn label pub
new fn navegacion_vacia_no_panickea
new fn open pub
new fn open_selected pub
new fn parent pub
new fn read pub
new fn scroll pub
new fn select pub
new fn selected_node pub
new fn sync_offset
new mod tests
new fn up pub

02_ruway/nahual/nahual-source-core/src/nouser.rs

new struct ArchivoVista
new struct MonadaVista
new struct NouserSource pub
new def PREF_ARCHIVO
new def PREF_MONADA
new def RAIZ
new fn arbol
new fn children
new fn escanear pub
new fn escanear_dir_inexistente_es_error
new fn label
new fn navega_raiz_monadas_y_archivos
new fn nodo_archivo
new fn read
new fn read_de_monada_o_raiz_es_error
new fn root
new mod tests

02_ruway/nahual/nahual-source-core/src/posix.rs

new struct PosixSource pub
new fn arbol
new fn children
new fn children_de_ruta_inexistente_es_error
new fn label
new fn new pub
new fn nombre_de
new fn read
new fn read_hoja_devuelve_bytes
new fn root
new fn root_y_children_navegan_y_ordenan
new mod tests

02_ruway/nahual/nahual-source-core/src/wawa.rs

new def RAIZ_SINTETICA
new struct WawaImgSource pub
new fn abrir pub
new fn abrir_archivo_no_wawa_es_error
new fn children
new fn id_basura_es_error
new fn img_sintetico
new fn label
new fn nodo_de
new fn parse_id
new fn raiz_anclada_navega_a_las_hojas
new fn read
new fn root
new fn sin_anclas_usa_raiz_sintetica
new mod tests

02_ruway/nahual/nahual-table-viewer-llimphi/src/lib.rs

new struct TableViewerPalette pub
new fn default
new fn from_theme pub
new fn table_viewer_view pub

02_ruway/nahual/nahual-text-viewer-llimphi/src/lib.rs

new def DEFAULT_PREVIEW_BYTES_MAX pub
new def MAX_CHARS
new def MAX_LINES
new enum PreviewState pub
new struct TextViewerPalette pub
new fn default
new fn default
new fn from_theme pub
new fn load_preview pub
new fn text_viewer_view pub
new fn truncate_preview

02_ruway/nahual/nahual-thumb-core/src/lib.rs

new struct CacheDisco pub
new struct CacheThumbs pub
new struct ClaveThumb pub
new struct Planificador pub
new enum ThumbError pub
new struct ThumbRgba pub
new fn aplicar_orientacion
new fn bytes_basura_dan_error_no_panic
new fn cache_clave_distinta_por_mtime
new fn cache_disco_nombre_codifica_la_clave
new fn cache_disco_roundtrip
new fn cache_guarda_y_recupera
new fn cache_retener_descarta
new fn cargar pub
new fn codificar_png
new fn completar pub
new fn contiene_archivo pub
new fn de_archivo pub
new fn decodificar_png
new fn dir pub
new fn empotrar_exif_orient
new fn empotrar_exif_thumb
new fn en pub
new fn en_vuelo pub
new fn es_jpeg
new fn exif_orientacion
new fn exif_tiff
new fn extrae_thumb_exif_embebido
new fn fast_path_ignora_thumb_embebido_diminuto
new fn fast_path_usa_el_thumb_embebido_no_el_full
new fn fmt
new fn fnv1a
new fn fnv1a_es_determinista
new fn genera_thumb_de_archivo_roundtrip
new fn genera_thumb_downscale_preserva_aspecto
new fn generar_thumb_de_archivo pub
new fn generar_thumb_de_bytes pub
new fn guardar pub
new fn imagen_chica_no_se_agranda
new fn insertar pub
new fn is_empty pub
new fn jpeg_exif_thumb
new fn jpeg_sin_exif_no_rompe
new fn jpeg_solido
new fn len pub
new fn nombre
new fn nuevo pub
new fn nuevo pub
new fn obtener pub
new fn obtener_o_generar pub
new fn obtener_o_generar_usa_y_puebla_el_disco
new fn olvidar_excepto pub
new fn orientacion_1_no_rota
new fn orientacion_exif_rota_el_thumb
new fn pendientes pub
new fn planificador_dedup_y_mejora_prioridad
new fn planificador_limita_concurrencia
new fn planificador_no_re_solicita_en_vuelo
new fn planificador_olvida_fuera_de_ventana
new fn planificador_prioriza_menor_numero
new fn png_solido
new fn por_defecto pub
new fn proximos pub
new mod pruebas
new fn reducir
new fn retener pub
new fn ruta
new fn solicitar pub
new fn thumb_demo
new fn tiff_ifd1_thumb
new fn tiff_orientacion
new fn tmpdir

02_ruway/nahual/nahual-tree-viewer-llimphi/src/lib.rs

new struct TreeViewerPalette pub
new fn default
new fn from_theme pub
new fn tree_viewer_view pub

02_ruway/nahual/nahual-video-viewer-llimphi/examples/video_viewer_demo.rs

new struct Model
new type Model
new enum Msg
new type Msg
new struct Showcase
new def TICK
new fn init
new fn initial_size
new fn main
new fn title
new fn update
new fn view

02_ruway/nahual/nahual-video-viewer-llimphi/src/lib.rs

new struct VideoViewerPalette pub
new struct VideoViewerState pub
new fn default
new fn default
new fn dimensions pub
new fn duration pub
new fn finished pub
new fn fmt_time
new fn fmt_time_basico
new fn frame_body
new fn from_source pub
new fn from_theme pub
new fn is_playing pub
new fn open_av1 pub
new fn open_gif pub
new fn open_inexistente_es_error
new fn open_webm pub
new fn placeholder_body
new fn position pub
new fn set_playing pub
new mod tests
new fn tick pub
new fn tick_sobre_fuente_produce_frame
new fn toggle_play pub
new fn video_viewer_view pub

02_ruway/nahual/nahual-viewer-core/src/archive.rs

new struct ArchiveEntry pub
new enum ArchiveKind pub
new struct ArchiveListing pub
new enum ArchivePreview pub
new def GIB
new def KIB
new def MAX_ENTRIES
new def MAX_NAME pub
new def MIB
new fn archivo_inexistente_es_error
new fn basura_no_es_zip
new fn bytes_humanos
new fn ellipsize_conserva_sufijo
new fn ellipsize_left pub
new fn ellipsize_no_toca_cortos
new fn fmt_bytes pub
new fn list_tar
new fn lista_tar_en_memoria
new fn lista_tar_gz_descomprimiendo
new fn listing_resume_y_lista
new fn load_archive pub
new fn load_zip
new fn render_listing pub
new fn tar_de_prueba
new mod tests

02_ruway/nahual/nahual-viewer-core/src/card.rs

new enum CardPreview pub
new def SAMPLE
new fn card_invalida_es_error
new fn default
new fn fmt_caps pub
new fn fmt_payload pub
new fn fmt_supervision pub
new fn load_card pub
new fn omite_campos_vacios
new fn parsea_y_resume_card
new fn summarize pub
new mod tests

02_ruway/nahual/nahual-viewer-core/src/hex.rs

new def COLS
new def DEFAULT_HEX_BYTES_MAX pub
new enum HexPreview pub
new fn default
new fn dos_filas_tienen_offset_correcto
new fn dump
new fn dump_basico_alinea_offset_hex_ascii
new fn load_hex pub
new fn load_inexistente_es_error
new fn no_imprimibles_son_punto
new mod tests

02_ruway/nahual/nahual-viewer-core/src/lib.rs

new mod archive pub
new mod card pub
new mod hex pub
new mod markdown pub
new mod table pub
new mod tree pub

02_ruway/nahual/nahual-viewer-core/src/markdown.rs

02_ruway/nahual/nahual-viewer-core/src/table.rs

new def DEFAULT_TABLE_BYTES_MAX pub
new def MAX_CELL_W
new def MAX_COLS
new def MAX_ROWS
new enum TablePreview pub
new fn celda_larga_se_trunca
new fn comilla_escapada
new fn default
new fn load_table pub
new fn pad
new fn parse_row
new fn parsea_campos_simples
new fn render
new fn render_alinea_y_cuenta
new fn respeta_comillas_con_delimitador
new mod tests

02_ruway/nahual/nahual-viewer-core/src/tree.rs

new def DEFAULT_TREE_BYTES_MAX pub
new def MAX_DEPTH
new def MAX_LINES
new def MAX_STR
new enum TreePreview pub
new fn basura_es_error
new fn default
new fn fmt_scalar
new fn json_minificado_se_indenta
new fn load_tree pub
new fn push_line
new fn render_tree
new fn string_largo_se_trunca
new mod tests
new fn toml_tambien_parsea
new fn walk

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02_ruway/nahual/ARQUITECTURA.md +149 −0
02_ruway/nahual/LEEME.md +35 −0
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02_ruway/nahual/README.qu.md +28 −0
02_ruway/nahual/libs/meta-runtime/Cargo.toml +12 −0
02_ruway/nahual/libs/meta-runtime/LEEME.md +9 −0
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02_ruway/nahual/libs/meta-runtime/src/parse.rs +263 −0
02_ruway/nahual/libs/meta-runtime/src/refs.rs +108 −0
02_ruway/nahual/libs/meta-runtime/src/testing.rs +312 −0
02_ruway/nahual/libs/meta-schema/Cargo.toml +14 −0
02_ruway/nahual/libs/meta-schema/LEEME.md +9 −0
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02_ruway/nahual/libs/meta-schema/src/lib.rs +1194 −0
02_ruway/nahual/libs/meta-schema/tests/example_modules.rs +99 −0
02_ruway/nahual/nahual-archive-viewer-llimphi/Cargo.toml +14 −0
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02_ruway/nahual/nahual-audio-viewer-llimphi/Cargo.toml +25 −0
02_ruway/nahual/nahual-audio-viewer-llimphi/examples/audio_viewer_demo.rs +81 −0
02_ruway/nahual/nahual-audio-viewer-llimphi/src/lib.rs +467 −0
02_ruway/nahual/nahual-card-viewer-llimphi/Cargo.toml +15 −0
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02_ruway/nahual/nahual-file-explorer-llimphi/Cargo.toml +14 −0
02_ruway/nahual/nahual-file-explorer-llimphi/LEEME.md +15 −0
02_ruway/nahual/nahual-file-explorer-llimphi/README.md +15 −0
02_ruway/nahual/nahual-file-explorer-llimphi/src/lib.rs +287 −0
02_ruway/nahual/nahual-font-viewer-llimphi/Cargo.toml +14 −0
02_ruway/nahual/nahual-font-viewer-llimphi/src/lib.rs +399 −0
02_ruway/nahual/nahual-gallery-llimphi/Cargo.toml +23 −0
02_ruway/nahual/nahual-gallery-llimphi/src/main.rs +1025 −0
02_ruway/nahual/nahual-geo-core/Cargo.toml +14 −0
02_ruway/nahual/nahual-geo-core/assets/world-countries.geojson +1 −0
02_ruway/nahual/nahual-geo-core/src/lib.rs +2499 −0
02_ruway/nahual/nahual-geo-core/src/pmtiles.rs +398 −0
02_ruway/nahual/nahual-geo-core/src/vt.rs +492 −0
02_ruway/nahual/nahual-hex-viewer-llimphi/Cargo.toml +14 −0
02_ruway/nahual/nahual-hex-viewer-llimphi/src/lib.rs +148 −0
02_ruway/nahual/nahual-image-viewer-llimphi/Cargo.toml +19 −0
02_ruway/nahual/nahual-image-viewer-llimphi/LEEME.md +15 −0
02_ruway/nahual/nahual-image-viewer-llimphi/README.md +15 −0
02_ruway/nahual/nahual-image-viewer-llimphi/examples/image_viewer_demo.rs +101 −0
02_ruway/nahual/nahual-image-viewer-llimphi/src/lib.rs +223 −0
02_ruway/nahual/nahual-map-viewer-llimphi/Cargo.toml +14 −0
02_ruway/nahual/nahual-map-viewer-llimphi/examples/probar.rs +103 −0
02_ruway/nahual/nahual-map-viewer-llimphi/samples/andes.geojson +60 −0
02_ruway/nahual/nahual-map-viewer-llimphi/samples/cuadricula.geojson +21 −0
02_ruway/nahual/nahual-map-viewer-llimphi/samples/cusco.gpx +29 −0
02_ruway/nahual/nahual-map-viewer-llimphi/samples/lima.kml +44 −0
02_ruway/nahual/nahual-map-viewer-llimphi/src/lib.rs +838 −0
02_ruway/nahual/nahual-markdown-viewer-llimphi/Cargo.toml +14 −0
02_ruway/nahual/nahual-markdown-viewer-llimphi/src/lib.rs +303 −0
02_ruway/nahual/nahual-shell-llimphi/Cargo.toml +43 −0
02_ruway/nahual/nahual-shell-llimphi/LEEME.md +15 −0
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02_ruway/nahual/nahual-shell-llimphi/src/main.rs +1295 −0
02_ruway/nahual/nahual-shell-llimphi/src/viewer_registry.rs +713 −0
02_ruway/nahual/nahual-shell-llimphi/viewers.d.example/README.md +53 −0
02_ruway/nahual/nahual-shell-llimphi/viewers.d.example/photoshop-a-imagen.json +43 −0
02_ruway/nahual/nahual-source-core/Cargo.toml +27 −0
02_ruway/nahual/nahual-source-core/src/lib.rs +151 −0
02_ruway/nahual/nahual-source-core/src/minga.rs +199 −0
02_ruway/nahual/nahual-source-core/src/navigator.rs +261 −0
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02_ruway/nahual/nahual-svg-viewer-llimphi/Cargo.toml +5 −0
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02_ruway/nahual/nahual-video-viewer-llimphi/Cargo.toml +21 −0
02_ruway/nahual/nahual-video-viewer-llimphi/README.md +45 −0
02_ruway/nahual/nahual-video-viewer-llimphi/examples/video_viewer_demo.rs +90 −0
02_ruway/nahual/nahual-video-viewer-llimphi/src/lib.rs +452 −0
02_ruway/nahual/nahual-viewer-core/Cargo.toml +19 −0
02_ruway/nahual/nahual-viewer-core/src/archive.rs +402 −0
02_ruway/nahual/nahual-viewer-core/src/card.rs +200 −0
02_ruway/nahual/nahual-viewer-core/src/hex.rs +128 −0
02_ruway/nahual/nahual-viewer-core/src/lib.rs +9 −0
02_ruway/nahual/nahual-viewer-core/src/markdown.rs +283 −0
02_ruway/nahual/nahual-viewer-core/src/table.rs +215 −0
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diff --git a/.gitignore b/.gitignore
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--- /dev/null
+++ b/.gitignore
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+/target
+**/*.rs.bk
+*.pdb
diff --git a/02_ruway/nahual/ARQUITECTURA.md b/02_ruway/nahual/ARQUITECTURA.md
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+# ARQUITECTURA.md — nahual
+
+> Descripción técnico-arquitectónica densa, optimizada para consumo por IA.
+> Snapshot: 2026-05-30. Fuente autoritativa cuando difiera con la prosa de los READMEs.
+
+```yaml
+DOMINIO: nahual
+CUADRANTE: 02_ruway (HACER)
+NOMBRE: nahuatl "espíritu acompañante"
+TESIS: meta-app "open-with universal" — abre cualquier dato heterogéneo despachando al visor correcto
+       según la NATURALEZA DISCERNIDA del contenido, NO la extensión del archivo
+PARADIGMA: shell + file-explorer + preview-pane; despacho por contenido (shuma-discern → viewer_registry::pick)
+PRINCIPIO: VIEWERS, NO EDITORS — visualización read-only; para editar se usa otra app (nada/pineal)
+TAMAÑO: ~9.5 KLoC; 2 libs + 11 visores productivos (+1 stub SVG)
+```
+
+## Flujo central (el corazón del dominio)
+
+```
+Archivo → read(8 KB header) → shuma-discern (pipeline de probes) → Discernment{ty, mime, lens, confidence}
+        → viewer_registry::pick(Discernment) → ViewerKind → Shell::load_for → PreviewPane::<X>(state) → <X>_viewer_view()
+
+EJEMPLO CLAVE: un .png renombrado a .txt → MagicBytes detecta 0x89PNG (conf 0.99) → ViewerKind::Image.
+Acierta pese a la extensión mentirosa. Esa es la tesis entera: contenido > extensión.
+```
+
+## Detección: `shuma-discern` (en `02_ruway/shuma/sandbox/shuma-discern`)
+
+```
+DiscernPipeline::default = [MagicBytes, CardProbe, JsonProbe, TomlProbe, TabularProbe, Utf8Probe]
+ESTRATEGIA: primer discerner con confidence ≥ 0.9 gana; si ninguno, el de mayor confidence.
+
+MagicBytes (0.99): PNG/JPEG/PDF/ELF/WASM/gzip/ZIP/tar(ustar@257)/GIF/WEBP/WAVE/FLAC/Ogg/MP3/EBML/IVF/TTF/OTF/ttcf.
+CardProbe (0.97): JSON con keys {schema_version,id,payload} → TypeRef::Wit{package:"brahman:card"}, lens "card". ANTES que JsonProbe.
+JsonProbe (0.95): serde_json parsea → lens "tree".
+TomlProbe (0.93): secciones [..]/clave=valor → lens "tree".
+TabularProbe (0.93): hint path .csv/.tsv + delimitador en 1ª línea → lens "table".
+Utf8Probe (0.5): UTF-8 válido, controles <5%; lens por extensión (.md→markdown, .rs/.py/.go/.js/.ts→code). Fallback universal.
+
+Discernment{ ty: TypeRef, confidence: f32, mime: Option<String>, lens: Option<String> }   // TypeRef viene de card-core
+```
+
+## Despacho: `viewer_registry::pick` (nahual-shell-llimphi/src/viewer_registry.rs, 200 LOC, 11 tests)
+
+```
+PRECEDENCIA:
+  1. lens explícito  gallery→Image · video→Video · audio→Audio · card→Card · tree→Tree · table→Table · markdown→Markdown · font→Font
+     EXCEPCIÓN: image/gif SIEMPRE → Video (anima aunque el lens sea gallery)
+  2. mime prefix     image/* → Image · video/* → Video · audio/* → Audio
+  3. mime contenedor application/{zip,x-tar,gzip} → Archive
+  4. mime binario    application/{x-executable,wasm} → Hex
+  5. fallback        Text (nunca falla feo)
+```
+
+## Visores implementados (11) — cada uno 200–600 LOC, bajo acoplamiento
+
+```
+Text     fallback UTF-8 + syntax por extensión (read-only sobre widget text-editor)
+Image    PNG/JPEG/WebP + GIF estático; pan/zoom, fit, magnifier, EXIF
+Video    WebM/MKV(AV1 nativo puro-Rust)/IVF + GIF animado; demuxer por extensión
+Audio    WAV/MP3/FLAC/Opus/Vorbis; espectro 48 bandas (Goertzel); sink cpal !Send vive en Model
+Card     shared/card (schema_version/id/payload) como campos legibles
+Tree     JSON/TOML indentado (legible aun minificado)
+Hex      ELF/wasm/binarios: dump offset+hex+ascii, 16 B/fila, sin deps
+Table    CSV/TSV columnas alineadas
+Markdown .md vía pulldown-cmark 0.12 (encabezados h1..h6, código, listas, citas)
+Archive  ZIP/jar/apk/epub/OOXML (zip 2.4) · tar(ustar@257) · tar.gz(flate2 streaming)
+Font     TTF/OTF: metadatos + MUESTRA DIBUJADA — ttf_parser::OutlineBuilder → kurbo::BezPath → paint_with
+         (showcase de render vectorial directo; se ve aunque la fuente no esté instalada)
+```
+
+## Libs declarativas (presentes, aún NO usadas por el shell)
+
+```
+meta-schema  (1172) schema declarativo de UIs data-driven: Module · EntitySpec · View{List,Form,Detail,Dashboard,Report,Graph}
+meta-runtime (2360) helpers puros: parseo tipado, validación, delta, formato/presentación
+USO ACTUAL: consumidos por Nakui/otros, NO por nahual-shell. Reservados para definir visores en JSON sin código Rust (futuro).
+```
+
+## Cómo registrar un visor nuevo (procedimiento real)
+
+```
+1. crate nahual-<x>-viewer-llimphi: struct <X>Preview + fn load_<x>(path) + fn <x>_viewer_view()
+2. shell main.rs: import + variante en enum PreviewPane + arm en load_for
+3. viewer_registry: variante ViewerKind::<X> + fila en pick() (lens/mime) + test
+4. shuma-discern: nuevo Discerner si hay magic-bytes/heurística nueva, o reusar lens existente
+5. (futuro) meta-schema: cuando exista AppBus, registro dinámico en tabla en vez de hardcode in-process
+```
+
+## Faltantes y limitaciones conocidas
+
+```
+PDF      shuma lo detecta (%PDF-, lens "reader") pero NO hay rasterizador PDF puro-Rust en el workspace ⇒ cae a Text. BLOQUEADO.
+SVG      stub (1 LOC), en construcción por otro agente.
+Deck     presentaciones — futuro.
+seek/scrub  video/audio sólo Space play/pausa; audio estima playhead con reloj (AudioSource type-erased, falta exponer Seekable).
+AppBus   NO existe aún: el registro de visores es HARDCODE in-process. Sin visores out-of-process ni registro dinámico.
+```
+
+## Relaciones inter-dominio
+
+```
+shuma    : shuma-discern es el cerebro de detección (pipeline de probes por magic-bytes + heurística).
+llimphi  : toda la UI — llimphi-ui/theme/layout(taffy)/text/raster(kurbo,peniko) + widgets {list,splitter,text-editor,tree}.
+card     : card-core aporta TypeRef/Discernment; shared/card es el formato del Card viewer. "brahman:card" es nombre legacy.
+media    : media-source-{av1,webm,gif} + media-audio-cpal + media-core(AudioProbe, Spectrum) para video/audio.
+wawa-config: preferencias (theme/lang) compartidas con el monorepo; watcher reactivo sin reinicio.
+minga    : card-discovery (en minga) es el widget de descubrimiento de Cards consumido por nahual-shell.   ← NEXO BRAHMAN
+```
+
+## Estado (2026-05-31)
+
+### Hecho
+- 11 visores en-proceso (Text/Image/Video/Audio/Card/Tree/Hex/Table/Markdown/Archive/Font), cada uno 200–600 LOC, bajo acoplamiento.
+- Shell con split draggable, navegación por teclado (↑↓ Enter Backspace Space) y despacho por contenido (no extensión) vía `shuma-discern` → `viewer_registry::pick`.
+- Galería de miniaturas (`nahual-gallery-llimphi`): `thumb-core` (generación + cache en disco + planificador), fast-path EXIF embebido, orientación EXIF, zoom de grilla, eviction RAM, badge de tamaño, slideshow, ordenamiento, preview a tamaño completo.
+- Espina del front universal: trait `Source` + 4 adapters (POSIX, wawa-image, NouserSource/Mónadas, MingaSource/DAG de AST); el shell monta nouser y minga por atajo.
+- Render vectorial directo en el font viewer; GIF reusa el video viewer sin crate nuevo. Menú principal + contextual en las vitrinas.
+
+### Pendiente
+- PDF: detectado por `shuma` pero sin rasterizador puro-Rust en el workspace → cae a Text (BLOQUEADO).
+- SVG: stub (1 LOC), en construcción.
+- Deck (presentaciones), seek/scrub real en video/audio (hoy sólo play/pausa), play por click.
+- AppBus / registro dinámico: hoy el `viewer_registry` es hardcode in-process; sin visores out-of-process registrados por `(lens, mime, priority)`.
+- Libs `meta-schema`/`meta-runtime` presentes pero aún NO consumidas por el shell (reservadas para visores data-driven en JSON).
+
+## Estado vs aspiración
+
+```
+ASPIRA_A:
+  - PDF (bloqueado por rasterizador) · SVG (WIP) · Deck · seek/scrub · play por click.
+  - AppBus / EntityType: visores FUERA-DE-PROCESO que se registran con (lens, mime, priority);
+    shell publica EntitySelected, viewers suscriben; registro pasa de hardcode a TABLA DINÁMICA.
+  - mover viewer_registry a crate compartido si otra app además del shell lo necesita.
+
+NORTE_ARQUITECTÓNICO:
+  nahual es el "abridor universal" de la suite: dado cualquier byte, discierne su naturaleza y lo muestra bien.
+  Hoy el registro de visores es estático e in-process. Su destino declarado es el AppBus: que cualquier app/servicio
+  registre un visor por (lens, mime, priority) y el shell despache out-of-process — exactamente el patrón de discovery
+  tipado que Brahman ya implementa para datos. nahual+AppBus ES el caso de uso natural de las Cards a nivel de UI.
+```
+
+---
+
+**Síntesis de una línea para otra IA:** nahual es una meta-app "open-with universal" que lee los primeros 8 KB de
+cualquier archivo, discierne su naturaleza por contenido (no extensión) vía un pipeline de probes (`shuma-discern`), y
+despacha al visor correcto de entre 11 (`viewer_registry::pick`) — read-only por principio, con detección robusta ante
+archivos mal renombrados, cuyo norte es reemplazar el registro estático in-process por un AppBus de visores
+out-of-process registrados por `(lens, mime, priority)`, que es justamente el patrón de discovery tipado de Brahman llevado a la UI.
diff --git a/02_ruway/nahual/LEEME.md b/02_ruway/nahual/LEEME.md
new file mode 100644
index 0000000..df3237d
--- /dev/null
+++ b/02_ruway/nahual/LEEME.md
@@ -0,0 +1,35 @@
+# nahual
+
+> `nahual` (náhuatl: *espíritu acompañante*). Visores cotidianos sobre Llimphi.
+
+Conjunto mínimo de viewers que el usuario espera de un escritorio: shell de archivos, viewer de texto, viewer de imagen. Implementados con la misma framework de UI; comparten preferencias con el resto del monorepo via `wawa-config`. Más un meta-runtime para definir nuevos viewers via schema sin escribir Rust desde cero.
+
+## Instalación
+
+```sh
+cargo run --release -p nahual-shell-llimphi
+cargo run --release -p nahual-file-explorer-llimphi
+cargo run --release -p nahual-text-viewer-llimphi
+cargo run --release -p nahual-image-viewer-llimphi
+```
+
+## Compatibilidad
+
+- **Linux / macOS / Windows** — UI Llimphi nativa.
+- **Wawa** — los viewers compilan adentro del kernel; el file explorer habla con `wawa-fs`.
+
+## Crates
+
+| Crate | Rol |
+|---|---|
+| [`meta-schema`](libs/meta-schema/README.md) | Schema declarativo de viewers. |
+| [`meta-runtime`](libs/meta-runtime/README.md) | Runtime que monta un viewer desde schema. |
+| [`nahual-shell-llimphi`](nahual-shell-llimphi/README.md) | Shell de archivos: navegación + acciones básicas. |
+| [`nahual-file-explorer-llimphi`](nahual-file-explorer-llimphi/README.md) | File explorer con tree + previews. |
+| [`nahual-text-viewer-llimphi`](nahual-text-viewer-llimphi/README.md) | Viewer de texto plano. |
+| [`nahual-image-viewer-llimphi`](nahual-image-viewer-llimphi/README.md) | Viewer de imagen (PNG/JPEG/WebP). |
+
+## Consideraciones
+
+- **Visualizadores, no editores.** Si querés editar el archivo, `nada`. Si querés editar la imagen, `pineal` o un editor externo.
+- El meta-runtime permite **definir un viewer en JSON** y obtener una app Llimphi sin código.
diff --git a/02_ruway/nahual/README.md b/02_ruway/nahual/README.md
new file mode 100644
index 0000000..de83f47
--- /dev/null
+++ b/02_ruway/nahual/README.md
@@ -0,0 +1,26 @@
+# nahual
+
+> `nahual` (Nahuatl: *companion spirit*). Everyday viewers over Llimphi.
+
+Minimal set of viewers a desktop user expects: file shell, text viewer, image viewer. Built on the same UI framework; share preferences with the rest of the monorepo via `wawa-config`. Plus a meta-runtime to define new viewers via schema without writing Rust from scratch.
+
+## Install
+
+```sh
+cargo run --release -p nahual-shell-llimphi
+cargo run --release -p nahual-file-explorer-llimphi
+cargo run --release -p nahual-text-viewer-llimphi
+cargo run --release -p nahual-image-viewer-llimphi
+```
+
+## Compatibility
+
+- **Linux / macOS / Windows** — native Llimphi UI.
+- **Wawa** — viewers compile inside the kernel; file explorer speaks `wawa-fs`.
+
+Crates listed in [README.md](README.md).
+
+## Considerations
+
+- **Viewers, not editors.** Edit the file → `nada`. Edit the image → `pineal` or external.
+- The meta-runtime lets you **define a viewer in JSON** and get a Llimphi app without code.
diff --git a/02_ruway/nahual/README.qu.md b/02_ruway/nahual/README.qu.md
new file mode 100644
index 0000000..0e067d9
--- /dev/null
+++ b/02_ruway/nahual/README.qu.md
@@ -0,0 +1,28 @@
+<!-- Quechua (Cusco/Collao). Revisión bienvenida. -->
+
+# nahual
+
+> `nahual` (nahuatl: *kasqachay espíritu*). Sapanka viewerkuna Llimphi patapi.
+
+Minimo viewerkuna runa escritorio suyay: archivo shell, qillqa viewer, siq'i viewer. Kikin UI framework patapi; preferencias monorepupawan `wawa-config`-rayku huñunku. Hinaspa meta-runtime: musuq viewers schema-pi ruway, mana Rust ñawpaqmanta qillqaspa.
+
+## Churay
+
+```sh
+cargo run --release -p nahual-shell-llimphi
+cargo run --release -p nahual-file-explorer-llimphi
+cargo run --release -p nahual-text-viewer-llimphi
+cargo run --release -p nahual-image-viewer-llimphi
+```
+
+## Tinkuy
+
+- **Linux / macOS / Windows** — natural Llimphi UI.
+- **Wawa** — viewerkuna kernel ukhupi wiñankun; file explorer `wawa-fs`-wan rimaq.
+
+Crateskuna listako [README.md](README.md)-pi.
+
+## Yuyaykunaq
+
+- **Viewerkuna, mana editorkuna.** Tikrana archivo → `nada`. Tikrana siq'i → `pineal` utaq hawanka.
+- Meta-runtime: huk **viewer JSON-pi munakuy**, Llimphi app aypay manchu kódigo.
diff --git a/02_ruway/nahual/libs/meta-runtime/Cargo.toml b/02_ruway/nahual/libs/meta-runtime/Cargo.toml
new file mode 100644
index 0000000..b105d82
--- /dev/null
+++ b/02_ruway/nahual/libs/meta-runtime/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "nahual-meta-runtime"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+description = "Yahweh — meta-runtime: helpers puros (parse, delta, validación, format) que cualquier widget metainterfaz consume sobre `yahweh-meta-schema`. Sin GPUI, sin backend específico — toma cierres/closures para acceder al store."
+
+[dependencies]
+serde_json = { workspace = true }
+thiserror = { workspace = true }
+uuid = { workspace = true, features = ["serde"] }
+nahual-meta-schema = { path = "../meta-schema" }
diff --git a/02_ruway/nahual/libs/meta-runtime/LEEME.md b/02_ruway/nahual/libs/meta-runtime/LEEME.md
new file mode 100644
index 0000000..d2ece72
--- /dev/null
+++ b/02_ruway/nahual/libs/meta-runtime/LEEME.md
@@ -0,0 +1,9 @@
+# meta-runtime
+
+> Runtime que monta un viewer desde [`meta-schema`](../meta-schema/README.md) de [nahual](../../README.md).
+
+Toma un `Schema` y produce un `View<Msg>` Llimphi. Permite "definir un viewer en JSON" sin escribir Rust.
+
+## Deps
+
+- [`meta-schema`](../meta-schema/README.md), [`llimphi-ui`](../../../llimphi/)
diff --git a/02_ruway/nahual/libs/meta-runtime/README.md b/02_ruway/nahual/libs/meta-runtime/README.md
new file mode 100644
index 0000000..f357be9
--- /dev/null
+++ b/02_ruway/nahual/libs/meta-runtime/README.md
@@ -0,0 +1,9 @@
+# meta-runtime
+
+> Runtime mounting a viewer from [`meta-schema`](../meta-schema/README.md) of [nahual](../../README.md).
+
+Takes a `Schema` and produces a Llimphi `View<Msg>`. Lets you "define a viewer in JSON" without writing Rust.
+
+## Deps
+
+- [`meta-schema`](../meta-schema/README.md), [`llimphi-ui`](../../../llimphi/)
diff --git a/02_ruway/nahual/libs/meta-runtime/src/backend.rs b/02_ruway/nahual/libs/meta-runtime/src/backend.rs
new file mode 100644
index 0000000..6d72246
--- /dev/null
+++ b/02_ruway/nahual/libs/meta-runtime/src/backend.rs
@@ -0,0 +1,288 @@
+//! `MetaBackend` trait — la frontera entre el widget metainterfaz
+//! (nahual) y la implementación concreta de persistencia/ejecución
+//! (nakui-core, Surreal, mocks para tests).
+//!
+//! El widget consume este trait; el binario lo implementa con su
+//! stack particular. Esto es lo que hace que el widget sea reusable.
+//!
+//! Convenciones documentadas en el doc del trait abajo.
+
+use std::collections::BTreeMap;
+
+use serde_json::Value;
+use uuid::Uuid;
+
+/// Resultado uniforme de una operación de escritura del backend.
+///
+/// La UI lo usa para componer el toast: `id` para mostrar el
+/// short_uuid, `changed` para diferenciar "actualizado X (3 campos)"
+/// vs "sin cambios", `post_status` para concatenar mensajes
+/// emitidos por hooks internos del backend (ej. "auto-compact:
+/// snapshot @ seq 49") sin que la UI tenga que conocer el detalle.
+#[derive(Debug, Clone, Default, PartialEq, Eq)]
+pub struct WriteOutcome {
+    /// Id del record afectado. `Some` para seed/update/delete;
+    /// `None` para morphism cuando afecta múltiples records.
+    pub id: Option<Uuid>,
+    /// Cantidad de cambios efectivos. `0` = no-op (edit que no
+    /// modificó ningún campo, etc.).
+    pub changed: usize,
+    /// Mensaje de status opcional para concatenar al toast del op
+    /// original con el separator estándar.
+    pub post_status: Option<String>,
+}
+
+impl WriteOutcome {
+    /// Constructor para no-op writes (edits sin cambios).
+    pub fn no_change(id: Uuid) -> Self {
+        Self {
+            id: Some(id),
+            changed: 0,
+            post_status: None,
+        }
+    }
+}
+
+/// Backend que un widget de metainterfaz usa para leer y mutar
+/// records. Decoupla el widget (nahual) de la implementación
+/// concreta (nakui-core, Surreal, mock para tests).
+///
+/// # Convención sobre ids
+///
+/// `Uuid` canónico. Backends que internamente usan otros tipos
+/// deben mapear via Uuid (hash determinista, wrapper, lo que sirva).
+/// Esto evita generic associated types que complicarían el dispatch
+/// en `cx.listener` de GPUI.
+///
+/// # Convención sobre validación
+///
+/// El backend ES la fuente de verdad sobre invariantes (KCL/Nickel
+/// post-checks, conservación, etc.). El widget pre-valida shape
+/// (nahual-meta-runtime: `parse_field_value`, `validate_entity_refs`)
+/// pero el backend puede rebotar con `Err(...)` si su validación
+/// adicional falla — el widget muestra el error al usuario.
+///
+/// # Convención sobre threading
+///
+/// `'static` (no `Send + Sync`): el widget vive en `Entity<MetaApp<B>>`
+/// que requiere `'static`, pero los handlers son single-threaded en
+/// el main UI thread de GPUI. Si en el futuro un backend necesita
+/// `cx.spawn`, agregamos los marker traits.
+///
+/// # Convención sobre delta computation
+///
+/// El widget pre-computa `set` y `clear` con
+/// [`crate::delta::compute_field_delta`] +
+/// [`crate::delta::compute_clear_fields`] *antes* de llamar a
+/// [`MetaBackend::update`]. El backend no recomputa: si recibe ambos
+/// vacíos devuelve `changed = 0` sin escribir nada. Esto evita
+/// double-roundtrip al store por el mismo dato.
+pub trait MetaBackend: 'static {
+    /// Snapshot ordenado de records de una entity.
+    /// Orden estable (lexicográfico por id) para UI determinista.
+    /// Vacío si no hay records.
+    fn list_records(&self, entity: &str) -> Vec<(Uuid, Value)>;
+
+    /// Lee un record por id. `None` si no existe.
+    fn load_record(&self, entity: &str, id: Uuid) -> Option<Value>;
+
+    /// Crea un record nuevo. El backend asigna el `Uuid`
+    /// (devuelve en `WriteOutcome.id`). `changed = 1` siempre.
+    fn seed(
+        &mut self,
+        entity: &str,
+        data: serde_json::Map<String, Value>,
+    ) -> Result<WriteOutcome, String>;
+
+    /// Edita un record existente. Aplica `set` (overrides) y
+    /// `clear` (key removal). `changed = set.len() + clear.len()`.
+    /// Si ambos están vacíos (no-op edit), devuelve
+    /// `WriteOutcome::no_change(id)` sin error y sin escribir al log.
+    fn update(
+        &mut self,
+        entity: &str,
+        id: Uuid,
+        set: serde_json::Map<String, Value>,
+        clear: Vec<String>,
+    ) -> Result<WriteOutcome, String>;
+
+    /// Borra un record. `changed = 1` si existía, error si no.
+    fn delete(&mut self, entity: &str, id: Uuid) -> Result<WriteOutcome, String>;
+
+    /// Ejecuta un morphism declarado por un módulo. El backend
+    /// resuelve la implementación, valida, computa ops, las aplica.
+    /// `changed = N ops aplicadas`.
+    ///
+    /// `module_id` ubica al módulo (el trait no asume estructura del
+    /// manifest — el backend lo resuelve internamente).
+    fn morphism(
+        &mut self,
+        module_id: &str,
+        name: &str,
+        inputs: BTreeMap<String, Uuid>,
+        params: Value,
+    ) -> Result<WriteOutcome, String>;
+}
+
+#[cfg(test)]
+mod tests {
+    //! Tests del trait via [`crate::testing::MockBackend`]. Verifican
+    //! el contrato genérico (object-safety, semantica de seed/update/
+    //! delete) sin atar a un backend concreto. Los tests del mock en
+    //! sí (constructores, with_morphism, etc.) viven en
+    //! `crate::testing::tests`.
+
+    use super::*;
+    use crate::testing::MockBackend;
+    use serde_json::json;
+
+    fn map_of(items: &[(&str, Value)]) -> serde_json::Map<String, Value> {
+        items
+            .iter()
+            .map(|(k, v)| (k.to_string(), v.clone()))
+            .collect()
+    }
+
+    #[test]
+    fn seed_then_load_round_trip() {
+        let mut b = MockBackend::new();
+        let out = b
+            .seed("Customer", map_of(&[("name", json!("Acme"))]))
+            .unwrap();
+        let id = out.id.expect("seed devuelve id");
+        assert_eq!(out.changed, 1);
+        assert!(out.post_status.is_none());
+
+        let rec = b.load_record("Customer", id).unwrap();
+        assert_eq!(rec.get("name"), Some(&json!("Acme")));
+    }
+
+    #[test]
+    fn list_records_filters_by_entity_and_orders_stably() {
+        let mut b = MockBackend::new();
+        let _ = b.seed("A", map_of(&[("k", json!(1))])).unwrap();
+        let _ = b.seed("B", map_of(&[("k", json!(2))])).unwrap();
+        let _ = b.seed("A", map_of(&[("k", json!(3))])).unwrap();
+
+        let a = b.list_records("A");
+        assert_eq!(a.len(), 2);
+        let b_only = b.list_records("B");
+        assert_eq!(b_only.len(), 1);
+        let none = b.list_records("Missing");
+        assert!(none.is_empty());
+
+        // Orden estable: re-llamadas devuelven mismo orden.
+        let a_again = b.list_records("A");
+        assert_eq!(
+            a.iter().map(|(id, _)| *id).collect::<Vec<_>>(),
+            a_again.iter().map(|(id, _)| *id).collect::<Vec<_>>(),
+        );
+    }
+
+    #[test]
+    fn update_with_set_changes_field() {
+        let mut b = MockBackend::new();
+        let id = b
+            .seed(
+                "Customer",
+                map_of(&[("name", json!("Acme")), ("notes", json!("x"))]),
+            )
+            .unwrap()
+            .id
+            .unwrap();
+
+        let out = b
+            .update(
+                "Customer",
+                id,
+                map_of(&[("name", json!("Acme S.A."))]),
+                vec![],
+            )
+            .unwrap();
+        assert_eq!(out.changed, 1);
+        assert_eq!(out.id, Some(id));
+
+        let rec = b.load_record("Customer", id).unwrap();
+        assert_eq!(rec.get("name"), Some(&json!("Acme S.A.")));
+        assert_eq!(rec.get("notes"), Some(&json!("x")), "notes intacto");
+    }
+
+    #[test]
+    fn update_with_clear_removes_key() {
+        let mut b = MockBackend::new();
+        let id = b
+            .seed(
+                "Customer",
+                map_of(&[("name", json!("Acme")), ("notes", json!("x"))]),
+            )
+            .unwrap()
+            .id
+            .unwrap();
+
+        let out = b
+            .update("Customer", id, serde_json::Map::new(), vec!["notes".into()])
+            .unwrap();
+        assert_eq!(out.changed, 1);
+
+        let rec = b.load_record("Customer", id).unwrap();
+        assert_eq!(rec.get("name"), Some(&json!("Acme")));
+        assert!(rec.get("notes").is_none(), "notes debería estar borrado");
+    }
+
+    #[test]
+    fn update_with_empty_set_and_clear_returns_no_change() {
+        let mut b = MockBackend::new();
+        let id = b
+            .seed("Customer", map_of(&[("name", json!("Acme"))]))
+            .unwrap()
+            .id
+            .unwrap();
+
+        let out = b
+            .update("Customer", id, serde_json::Map::new(), vec![])
+            .unwrap();
+        assert_eq!(out, WriteOutcome::no_change(id));
+    }
+
+    #[test]
+    fn update_on_missing_record_errors() {
+        let mut b = MockBackend::new();
+        let id = Uuid::new_v4();
+        let err = b
+            .update("Customer", id, map_of(&[("x", json!(1))]), vec![])
+            .unwrap_err();
+        assert!(err.contains("not found"));
+    }
+
+    #[test]
+    fn delete_removes_and_then_load_returns_none() {
+        let mut b = MockBackend::new();
+        let id = b
+            .seed("Customer", map_of(&[("name", json!("Acme"))]))
+            .unwrap()
+            .id
+            .unwrap();
+        let out = b.delete("Customer", id).unwrap();
+        assert_eq!(out.changed, 1);
+        assert_eq!(out.id, Some(id));
+        assert!(b.load_record("Customer", id).is_none());
+    }
+
+    #[test]
+    fn delete_on_missing_record_errors() {
+        let mut b = MockBackend::new();
+        let id = Uuid::new_v4();
+        assert!(b.delete("Customer", id).is_err());
+    }
+
+    /// Sanity: el trait acepta llamadas via `&mut dyn MetaBackend`
+    /// (object-safety). Esto permite que el widget tenga
+    /// `Box<dyn MetaBackend>` si el use case requiere borrado de
+    /// tipo (vs. el path normal con `MetaApp<B: MetaBackend>`).
+    #[test]
+    fn trait_is_object_safe() {
+        let mut b: Box<dyn MetaBackend> = Box::new(MockBackend::new());
+        let _ = b.seed("X", map_of(&[("k", json!(1))])).unwrap();
+        assert_eq!(b.list_records("X").len(), 1);
+    }
+}
diff --git a/02_ruway/nahual/libs/meta-runtime/src/csv.rs b/02_ruway/nahual/libs/meta-runtime/src/csv.rs
new file mode 100644
index 0000000..114d616
--- /dev/null
+++ b/02_ruway/nahual/libs/meta-runtime/src/csv.rs
@@ -0,0 +1,67 @@
+//! Serialización de filas a CSV (RFC 4180) para exportar listas.
+
+/// Arma un documento CSV: una línea de headers + una por fila. Cada
+/// celda se escapa si contiene coma, comilla o salto de línea.
+pub fn to_csv(headers: &[String], rows: &[Vec<String>]) -> String {
+    let mut out = String::new();
+    push_csv_line(&mut out, headers);
+    for row in rows {
+        push_csv_line(&mut out, row);
+    }
+    out
+}
+
+/// Agrega una línea CSV (celdas separadas por coma + `\n` final).
+fn push_csv_line(out: &mut String, cells: &[String]) {
+    for (i, cell) in cells.iter().enumerate() {
+        if i > 0 {
+            out.push(',');
+        }
+        out.push_str(&csv_escape(cell));
+    }
+    out.push('\n');
+}
+
+/// Escapa una celda: la envuelve en comillas y duplica las comillas
+/// internas si contiene coma, comilla, CR o LF. Si no, va tal cual.
+fn csv_escape(s: &str) -> String {
+    if s.contains([',', '"', '\n', '\r']) {
+        format!("\"{}\"", s.replace('"', "\"\""))
+    } else {
+        s.to_string()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn plain_cells_unquoted() {
+        let csv = to_csv(
+            &["Nombre".into(), "Edad".into()],
+            &[vec!["Ana".into(), "30".into()]],
+        );
+        assert_eq!(csv, "Nombre,Edad\nAna,30\n");
+    }
+
+    #[test]
+    fn cells_with_comma_or_quote_are_escaped() {
+        let csv = to_csv(
+            &["a".into(), "b".into()],
+            &[vec!["x,y".into(), "dijo \"hola\"".into()]],
+        );
+        assert_eq!(csv, "a,b\n\"x,y\",\"dijo \"\"hola\"\"\"\n");
+    }
+
+    #[test]
+    fn newline_in_cell_is_quoted() {
+        let csv = to_csv(&["n".into()], &[vec!["línea1\nlínea2".into()]]);
+        assert_eq!(csv, "n\n\"línea1\nlínea2\"\n");
+    }
+
+    #[test]
+    fn empty_rows_yields_just_header() {
+        assert_eq!(to_csv(&["x".into()], &[]), "x\n");
+    }
+}
diff --git a/02_ruway/nahual/libs/meta-runtime/src/delta.rs b/02_ruway/nahual/libs/meta-runtime/src/delta.rs
new file mode 100644
index 0000000..2b0e560
--- /dev/null
+++ b/02_ruway/nahual/libs/meta-runtime/src/delta.rs
@@ -0,0 +1,137 @@
+//! Cálculo del delta entre el record actual y la propuesta del form.
+//!
+//! Sirve a un runtime de edición para emitir SOLO los Set/Clear que
+//! cambian algo: log + apply minimales, no-op edits = 0 entries.
+
+use serde_json::Value;
+
+/// Calcula el delta entre el record actual y los valores propuestos
+/// del form. Devuelve un Map con sólo los campos cuyo valor difiere.
+///
+/// Comparación: igualdad estructural sobre `serde_json::Value`. Un
+/// `current=Value::Null` (record no encontrado) hace que todos los
+/// campos del `proposed` sean considerados nuevos. Un campo del
+/// proposed que coincide con el del current se omite. Campos que
+/// están en current pero NO en proposed se preservan tal cual (el
+/// edit no los toca; ver [`compute_clear_fields`] para borrar
+/// explícito desde un input vacío).
+pub fn compute_field_delta(
+    current: &Value,
+    proposed: &serde_json::Map<String, Value>,
+) -> serde_json::Map<String, Value> {
+    proposed
+        .iter()
+        .filter(|(field, value)| current.get(field.as_str()) != Some(*value))
+        .map(|(k, v)| (k.clone(), v.clone()))
+        .collect()
+}
+
+/// Decide cuáles fields del `to_clear` candidate list ameritan
+/// realmente un `FieldOp::Clear`: sólo los que existen en el current
+/// con un valor non-null. Para fields ausentes o ya null, Clear es
+/// no-op semántico (el post-state es el mismo) y dropearlos
+/// preserva la propiedad "1 op = 1 cambio efectivo" del log.
+///
+/// Preserva el orden del input para que el log entry sea estable.
+pub fn compute_clear_fields(current: &Value, to_clear: &[String]) -> Vec<String> {
+    to_clear
+        .iter()
+        .filter(|f| match current.get(f.as_str()) {
+            None | Some(Value::Null) => false,
+            Some(_) => true,
+        })
+        .cloned()
+        .collect()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use serde_json::json;
+
+    fn map(items: &[(&str, Value)]) -> serde_json::Map<String, Value> {
+        items
+            .iter()
+            .map(|(k, v)| (k.to_string(), v.clone()))
+            .collect()
+    }
+
+    #[test]
+    fn delta_empty_when_all_fields_match() {
+        let current = json!({"name": "Acme", "saldo": 100_i64, "currency": "USD"});
+        let proposed = map(&[
+            ("name", json!("Acme")),
+            ("saldo", json!(100_i64)),
+            ("currency", json!("USD")),
+        ]);
+        assert!(compute_field_delta(&current, &proposed).is_empty());
+    }
+
+    #[test]
+    fn delta_includes_only_changed_field() {
+        let current = json!({"name": "Acme", "saldo": 100_i64});
+        let proposed = map(&[("name", json!("Acme")), ("saldo", json!(200_i64))]);
+        let d = compute_field_delta(&current, &proposed);
+        assert_eq!(d.len(), 1);
+        assert_eq!(d.get("saldo"), Some(&json!(200_i64)));
+    }
+
+    #[test]
+    fn delta_treats_missing_record_as_all_new() {
+        let current = Value::Null;
+        let proposed = map(&[("name", json!("Acme")), ("saldo", json!(0_i64))]);
+        assert_eq!(compute_field_delta(&current, &proposed).len(), 2);
+    }
+
+    #[test]
+    fn delta_distinguishes_int_from_string_repr() {
+        let current = json!({"qty": 100_i64});
+        let proposed = map(&[("qty", json!(100_i64))]);
+        assert!(compute_field_delta(&current, &proposed).is_empty());
+
+        let current_str = json!({"qty": "100"});
+        let proposed_int = map(&[("qty", json!(100_i64))]);
+        assert_eq!(compute_field_delta(&current_str, &proposed_int).len(), 1);
+    }
+
+    #[test]
+    fn delta_skips_fields_absent_from_proposed() {
+        let current = json!({"name": "Acme", "saldo": 100_i64, "extra": "x"});
+        let proposed = map(&[("name", json!("Acme")), ("saldo", json!(150_i64))]);
+        let d = compute_field_delta(&current, &proposed);
+        assert_eq!(d.len(), 1);
+        assert!(!d.contains_key("extra"));
+    }
+
+    #[test]
+    fn clear_fields_skips_absent_and_null() {
+        let current = json!({"name": "Acme", "notes": "lorem", "tag": null});
+        let to_clear = vec![
+            "name".into(),
+            "notes".into(),
+            "tag".into(),
+            "missing".into(),
+        ];
+        assert_eq!(
+            compute_clear_fields(&current, &to_clear),
+            vec!["name".to_string(), "notes".to_string()]
+        );
+    }
+
+    #[test]
+    fn clear_fields_preserves_input_order() {
+        let current = json!({"a": 1, "b": 2, "c": 3});
+        let to_clear = vec!["c".into(), "a".into(), "b".into()];
+        assert_eq!(
+            compute_clear_fields(&current, &to_clear),
+            vec!["c", "a", "b"]
+        );
+    }
+
+    #[test]
+    fn clear_fields_empty_when_current_is_null() {
+        let current = Value::Null;
+        let to_clear = vec!["name".into()];
+        assert!(compute_clear_fields(&current, &to_clear).is_empty());
+    }
+}
diff --git a/02_ruway/nahual/libs/meta-runtime/src/format.rs b/02_ruway/nahual/libs/meta-runtime/src/format.rs
new file mode 100644
index 0000000..c8a7677
--- /dev/null
+++ b/02_ruway/nahual/libs/meta-runtime/src/format.rs
@@ -0,0 +1,344 @@
+//! Helpers de presentación humana para records y values.
+//!
+//! Sin GPUI: devuelven `String`s. El widget renderer los wrap-ea
+//! en `div().child(...)` o equivalente.
+
+use std::cmp::Ordering;
+
+use serde_json::Value;
+use uuid::Uuid;
+
+use nahual_meta_schema::ValueFormat;
+
+/// Compara dos valores de celda para ordenar una lista. `None`/`null`
+/// ordenan antes que cualquier valor. Números por valor numérico,
+/// strings case-insensitive, bools `false < true`; tipos mixtos por su
+/// forma string (orden estable, no semántico).
+pub fn cmp_values(a: Option<&Value>, b: Option<&Value>) -> Ordering {
+    let nullish = |v: Option<&Value>| matches!(v, None | Some(Value::Null));
+    match (nullish(a), nullish(b)) {
+        (true, true) => return Ordering::Equal,
+        (true, false) => return Ordering::Less,
+        (false, true) => return Ordering::Greater,
+        (false, false) => {}
+    }
+    match (a, b) {
+        (Some(Value::Number(x)), Some(Value::Number(y))) => x
+            .as_f64()
+            .partial_cmp(&y.as_f64())
+            .unwrap_or(Ordering::Equal),
+        (Some(Value::String(x)), Some(Value::String(y))) => x.to_lowercase().cmp(&y.to_lowercase()),
+        (Some(Value::Bool(x)), Some(Value::Bool(y))) => x.cmp(y),
+        (Some(x), Some(y)) => x.to_string().cmp(&y.to_string()),
+        // Inalcanzable: el chequeo nullish de arriba cubre los None.
+        _ => Ordering::Equal,
+    }
+}
+
+/// Etiqueta humana para representar un record en el selector de
+/// EntityRef y en columnas de referencia. Heurística: prefiere campos
+/// de nombre comunes (ES + EN); fallback al UUID corto.
+pub fn human_label_for_record(value: &Value, id: &Uuid) -> String {
+    for key in [
+        "name", "nombre", "label", "title", "titulo", "sku", "sku_id",
+    ] {
+        if let Some(v) = value.get(key).and_then(Value::as_str) {
+            if !v.is_empty() {
+                return format!("{} ({})", v, short_uuid(id));
+            }
+        }
+    }
+    short_uuid(id)
+}
+
+/// Render legible de un `Value` arbitrario para mostrar en una celda
+/// de lista. Strings van pelados; bools como ✓/✗; el resto via
+/// `Display`.
+pub fn render_value(v: Option<&Value>) -> String {
+    match v {
+        None | Some(Value::Null) => String::new(),
+        Some(Value::String(s)) => s.clone(),
+        Some(Value::Bool(b)) => if *b { "✓" } else { "✗" }.to_string(),
+        Some(Value::Number(n)) => n.to_string(),
+        Some(other) => other.to_string(),
+    }
+}
+
+/// Render de un valor de celda según un [`ValueFormat`]. `Plain`
+/// delega en [`render_value`]; `Number`/`Currency` agrupan miles. Un
+/// valor no numérico bajo `Number`/`Currency` cae a `render_value`.
+pub fn format_value(v: Option<&Value>, fmt: &ValueFormat) -> String {
+    match fmt {
+        ValueFormat::Plain => render_value(v),
+        ValueFormat::Number => match v {
+            Some(Value::Number(n)) => group_thousands(n),
+            _ => render_value(v),
+        },
+        ValueFormat::Currency { symbol } => match v {
+            Some(Value::Number(n)) => format!("{symbol}{}", group_thousands(n)),
+            _ => render_value(v),
+        },
+    }
+}
+
+/// Formatea un `Number` con separador de miles. Enteros sin decimales;
+/// flotantes con dos.
+fn group_thousands(n: &serde_json::Number) -> String {
+    if let Some(i) = n.as_i64() {
+        group_int(i)
+    } else if let Some(f) = n.as_f64() {
+        let neg = f.is_sign_negative();
+        let cents = (f.abs() * 100.0).round() as i64;
+        format!(
+            "{}{}.{:02}",
+            if neg { "-" } else { "" },
+            group_int(cents / 100),
+            cents % 100,
+        )
+    } else {
+        n.to_string()
+    }
+}
+
+/// Inserta comas cada tres dígitos en un entero con signo.
+fn group_int(i: i64) -> String {
+    let digits = i.unsigned_abs().to_string();
+    let bytes = digits.as_bytes();
+    let mut out = String::new();
+    for (idx, &b) in bytes.iter().enumerate() {
+        if idx > 0 && (bytes.len() - idx).is_multiple_of(3) {
+            out.push(',');
+        }
+        out.push(b as char);
+    }
+    if i < 0 {
+        format!("-{out}")
+    } else {
+        out
+    }
+}
+
+/// Conversión inversa a `parse_field_value`: del JSON al texto raw
+/// que un input puede tomar y volver a parsearse igual al submit.
+/// Usado para pre-llenar inputs en modo edit.
+pub fn value_to_input_text(v: &Value) -> String {
+    match v {
+        Value::Null => String::new(),
+        Value::String(s) => s.clone(),
+        Value::Bool(b) => if *b { "true" } else { "false" }.to_string(),
+        Value::Number(n) => n.to_string(),
+        other => other.to_string(),
+    }
+}
+
+/// Primeros 8 chars del UUID en forma canónica. Útil para logs y UI
+/// donde el UUID full es ruido visual.
+pub fn short_uuid(id: &Uuid) -> String {
+    id.to_string().chars().take(8).collect()
+}
+
+/// Hex string de los primeros 4 bytes de un hash SHA-256 (8
+/// caracteres). Útil para mostrar bundle/schema hashes en UI sin
+/// quemar pantalla con los 64 chars completos.
+pub fn short_hash(h: &[u8; 32]) -> String {
+    use std::fmt::Write;
+    let mut s = String::with_capacity(8);
+    for b in h.iter().take(4) {
+        let _ = write!(s, "{:02x}", b);
+    }
+    s
+}
+
+/// Renderea un `serde_json::Value` en una sola línea, truncado a
+/// `max` caracteres con `...` al final si excede. Para preview en
+/// timelines/cards/listas — NO para edición.
+///
+/// `max` es un upper-bound aproximado: el resultado nunca excede
+/// `max` chars, pero puede ser más corto si el value es chico.
+pub fn preview_value(v: &Value, max: usize) -> String {
+    let s = v.to_string();
+    if s.chars().count() <= max {
+        s
+    } else if max < 3 {
+        s.chars().take(max).collect()
+    } else {
+        let truncated: String = s.chars().take(max - 3).collect();
+        format!("{truncated}...")
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use serde_json::json;
+
+    #[test]
+    fn human_label_prefers_name_over_id() {
+        let id = Uuid::new_v4();
+        let v = json!({"name": "Acme S.A.", "email": "x@y.z"});
+        let label = human_label_for_record(&v, &id);
+        assert!(label.starts_with("Acme S.A."));
+        assert!(label.contains(&short_uuid(&id)));
+    }
+
+    #[test]
+    fn human_label_falls_back_through_label_title_sku() {
+        let id = Uuid::new_v4();
+        let only_label = json!({"label": "X"});
+        assert!(human_label_for_record(&only_label, &id).starts_with("X "));
+        let only_title = json!({"title": "Y"});
+        assert!(human_label_for_record(&only_title, &id).starts_with("Y "));
+        let only_sku = json!({"sku": "Z"});
+        assert!(human_label_for_record(&only_sku, &id).starts_with("Z "));
+        let only_sku_id = json!({"sku_id": "W"});
+        assert!(human_label_for_record(&only_sku_id, &id).starts_with("W "));
+    }
+
+    #[test]
+    fn human_label_falls_back_to_short_uuid_when_no_keys_match() {
+        let id = Uuid::new_v4();
+        let v = json!({"random": "field"});
+        assert_eq!(human_label_for_record(&v, &id), short_uuid(&id));
+    }
+
+    #[test]
+    fn human_label_recognizes_spanish_name_fields() {
+        let id = Uuid::new_v4();
+        assert!(human_label_for_record(&json!({"nombre": "Acme"}), &id).starts_with("Acme "));
+        assert!(human_label_for_record(&json!({"titulo": "Trato"}), &id).starts_with("Trato "));
+    }
+
+    #[test]
+    fn format_value_number_groups_thousands() {
+        assert_eq!(
+            format_value(Some(&json!(12000)), &ValueFormat::Number),
+            "12,000"
+        );
+        assert_eq!(format_value(Some(&json!(5)), &ValueFormat::Number), "5");
+        assert_eq!(
+            format_value(Some(&json!(-1234567)), &ValueFormat::Number),
+            "-1,234,567"
+        );
+    }
+
+    #[test]
+    fn format_value_currency_prefixes_symbol() {
+        let fmt = ValueFormat::Currency { symbol: "$".into() };
+        assert_eq!(format_value(Some(&json!(25000)), &fmt), "$25,000");
+    }
+
+    #[test]
+    fn format_value_float_gets_two_decimals() {
+        assert_eq!(
+            format_value(Some(&json!(1234.5)), &ValueFormat::Number),
+            "1,234.50"
+        );
+    }
+
+    #[test]
+    fn cmp_values_orders_numbers_strings_nulls() {
+        // Números por valor, no lexicográfico.
+        assert_eq!(
+            cmp_values(Some(&json!(2)), Some(&json!(10))),
+            Ordering::Less
+        );
+        // Strings case-insensitive.
+        assert_eq!(
+            cmp_values(Some(&json!("banana")), Some(&json!("Apple"))),
+            Ordering::Greater
+        );
+        // null/None ordena primero.
+        assert_eq!(cmp_values(None, Some(&json!(1))), Ordering::Less);
+        assert_eq!(
+            cmp_values(Some(&Value::Null), Some(&json!("x"))),
+            Ordering::Less
+        );
+        assert_eq!(
+            cmp_values(Some(&json!(5)), Some(&json!(5))),
+            Ordering::Equal
+        );
+        // Bools.
+        assert_eq!(
+            cmp_values(Some(&json!(false)), Some(&json!(true))),
+            Ordering::Less
+        );
+    }
+
+    #[test]
+    fn format_value_non_number_falls_back_to_render_value() {
+        assert_eq!(
+            format_value(Some(&json!("hola")), &ValueFormat::Plain),
+            "hola"
+        );
+        let fmt = ValueFormat::Currency { symbol: "$".into() };
+        assert_eq!(format_value(Some(&json!("x")), &fmt), "x");
+        assert_eq!(format_value(None, &ValueFormat::Number), "");
+    }
+
+    #[test]
+    fn render_value_handles_basic_kinds() {
+        assert_eq!(render_value(None), "");
+        assert_eq!(render_value(Some(&Value::Null)), "");
+        assert_eq!(render_value(Some(&json!("hola"))), "hola");
+        assert_eq!(render_value(Some(&json!(true))), "✓");
+        assert_eq!(render_value(Some(&json!(false))), "✗");
+        assert_eq!(render_value(Some(&json!(42))), "42");
+    }
+
+    #[test]
+    fn value_to_input_text_round_trip_with_strings_and_numbers() {
+        assert_eq!(value_to_input_text(&Value::Null), "");
+        assert_eq!(value_to_input_text(&json!("x")), "x");
+        assert_eq!(value_to_input_text(&json!(true)), "true");
+        assert_eq!(value_to_input_text(&json!(false)), "false");
+        assert_eq!(value_to_input_text(&json!(42)), "42");
+    }
+
+    #[test]
+    fn short_hash_takes_first_4_bytes_hex() {
+        let mut h = [0u8; 32];
+        h[0] = 0xaa;
+        h[1] = 0xbb;
+        h[2] = 0xcc;
+        h[3] = 0xdd;
+        assert_eq!(short_hash(&h), "aabbccdd");
+    }
+
+    #[test]
+    fn short_hash_zeros() {
+        let h = [0u8; 32];
+        assert_eq!(short_hash(&h), "00000000");
+    }
+
+    #[test]
+    fn preview_value_keeps_short_strings_intact() {
+        let v = json!({"a": 1});
+        assert_eq!(preview_value(&v, 30), "{\"a\":1}");
+    }
+
+    #[test]
+    fn preview_value_truncates_long_strings_with_ellipsis() {
+        let v = json!({"a": "x".repeat(200)});
+        let p = preview_value(&v, 30);
+        assert!(p.chars().count() <= 30);
+        assert!(p.ends_with("..."));
+    }
+
+    #[test]
+    fn preview_value_handles_max_smaller_than_ellipsis() {
+        // Edge case: max < 3 (no espacio para "..."). Devuelve
+        // los primeros `max` chars sin sufijo, sin panic.
+        let v = json!("xxxxxxxxxxxxxxxx");
+        let p = preview_value(&v, 2);
+        assert!(p.chars().count() <= 2);
+    }
+
+    #[test]
+    fn short_uuid_returns_first_8_chars() {
+        let id = Uuid::parse_str("01ARZ3ND-EKTS-V4RR-FFQ6-9G5FAV000000").ok();
+        // Si el parse falla, usamos uno fresco — el invariant es la
+        // longitud, no el contenido.
+        let id = id.unwrap_or_else(Uuid::new_v4);
+        assert_eq!(short_uuid(&id).len(), 8);
+    }
+}
diff --git a/02_ruway/nahual/libs/meta-runtime/src/lib.rs b/02_ruway/nahual/libs/meta-runtime/src/lib.rs
new file mode 100644
index 0000000..e3d4e38
--- /dev/null
+++ b/02_ruway/nahual/libs/meta-runtime/src/lib.rs
@@ -0,0 +1,46 @@
+//! `nahual-meta-runtime` — helpers puros para runtimes metainterfaz.
+//!
+//! Consume [`nahual_meta_schema`] (los tipos `Module`/`View`/`FieldSpec`/
+//! `FieldKind`/`Action`/etc.) y aporta funciones puras que cualquier
+//! widget renderer o backend ejecutor necesita:
+//!
+//! - **Parse**: convertir el texto de un input a `serde_json::Value`
+//!   tipado según el `FieldKind` del spec.
+//! - **Delta**: calcular qué cambió entre el estado actual y la
+//!   propuesta del form (Set + Clear).
+//! - **Validation**: verificar que cada EntityRef apunte a un record
+//!   que existe (toma cierre `load`, no trait).
+//! - **Format**: presentación humana de records (label heurístico,
+//!   render de values, UUID corto, round-trip a input text).
+//!
+//! Sin GPUI, sin acoplamiento a un backend específico. Cualquier
+//! implementación de store/log puede consumirlos.
+//!
+//! El widget render (form/list/modal) vive en otro crate nahual
+//! que esto consume; el runtime concreto (`nakui-ui`) implementa la
+//! conexión a su event-log/executor y compone ambos.
+
+#![forbid(unsafe_code)]
+
+pub mod backend;
+pub mod csv;
+pub mod delta;
+pub mod format;
+pub mod metric;
+pub mod parse;
+pub mod refs;
+pub mod testing;
+
+pub use backend::{MetaBackend, WriteOutcome};
+pub use csv::to_csv;
+pub use delta::{compute_clear_fields, compute_field_delta};
+pub use format::{
+    cmp_values, format_value, human_label_for_record, preview_value, render_value, short_hash,
+    short_uuid, value_to_input_text,
+};
+pub use metric::{
+    breakdown_to_csv, bucket_date, compute_metric, cumulative_breakdown, limit_breakdown,
+    record_matches, sort_breakdown_by_key, MetricResult, OTROS_LABEL,
+};
+pub use parse::{infer_param_value, parse_field_value, resolve_param_value};
+pub use refs::validate_entity_refs;
diff --git a/02_ruway/nahual/libs/meta-runtime/src/metric.rs b/02_ruway/nahual/libs/meta-runtime/src/metric.rs
new file mode 100644
index 0000000..1102d93
--- /dev/null
+++ b/02_ruway/nahual/libs/meta-runtime/src/metric.rs
@@ -0,0 +1,917 @@
+//! Cómputo de los agregados de un tablero (`DashboardCard`).
+
+use std::collections::BTreeMap;
+
+use serde_json::Value;
+use uuid::Uuid;
+
+use std::cmp::Ordering;
+
+use nahual_meta_schema::{CardFilter, DateBucket, FilterOp, Metric};
+
+/// Resultado de computar una [`Metric`] sobre un conjunto de records.
+#[derive(Debug, Clone, PartialEq)]
+pub enum MetricResult {
+    /// Un único número — `Count` / `Sum` / `Avg` / `Min` / `Max`.
+    Scalar(f64),
+    /// Conteo por grupo, ordenado de mayor a menor — `GroupBy`.
+    Breakdown(Vec<(String, usize)>),
+    /// Valor numérico agregado por grupo, ordenado de mayor a menor —
+    /// `SumBy` / `AvgBy`. Se formatea con el `ValueFormat` de la
+    /// tarjeta (p.ej. moneda), a diferencia del conteo de `Breakdown`.
+    ValueBreakdown(Vec<(String, f64)>),
+    /// Desglose de **dos dimensiones** — `SumBySeries`. `groups` es el
+    /// eje principal (x), ordenado; `series` es una lista de
+    /// `(etiqueta_serie, valores)` donde `valores[i]` es el agregado de
+    /// esa serie en `groups[i]` (0.0 si no hay datos). Cada serie queda
+    /// alineada 1:1 con `groups`. Las series se ordenan por su total
+    /// descendente.
+    MultiBreakdown {
+        groups: Vec<String>,
+        series: Vec<(String, Vec<f64>)>,
+    },
+}
+
+/// Computa el agregado de una tarjeta sobre `records`, aplicando el
+/// `filter` si lo hay.
+pub fn compute_metric(
+    metric: &Metric,
+    filter: Option<&CardFilter>,
+    records: &[(Uuid, Value)],
+) -> MetricResult {
+    let passes = |v: &Value| match filter {
+        None => true,
+        Some(f) => filter_passes(v, f),
+    };
+    match metric {
+        Metric::Count => {
+            let n = records.iter().filter(|(_, v)| passes(v)).count();
+            MetricResult::Scalar(n as f64)
+        }
+        Metric::Sum { field } => {
+            let total: f64 = records
+                .iter()
+                .filter(|(_, v)| passes(v))
+                .filter_map(|(_, v)| v.get(field).and_then(Value::as_f64))
+                .sum();
+            MetricResult::Scalar(total)
+        }
+        Metric::Avg { field } => {
+            let nums: Vec<f64> = records
+                .iter()
+                .filter(|(_, v)| passes(v))
+                .filter_map(|(_, v)| v.get(field).and_then(Value::as_f64))
+                .collect();
+            let avg = if nums.is_empty() {
+                0.0
+            } else {
+                nums.iter().sum::<f64>() / nums.len() as f64
+            };
+            MetricResult::Scalar(avg)
+        }
+        Metric::Min { field } => {
+            let m = records
+                .iter()
+                .filter(|(_, v)| passes(v))
+                .filter_map(|(_, v)| v.get(field).and_then(Value::as_f64))
+                .fold(f64::INFINITY, f64::min);
+            MetricResult::Scalar(if m.is_finite() { m } else { 0.0 })
+        }
+        Metric::Max { field } => {
+            let m = records
+                .iter()
+                .filter(|(_, v)| passes(v))
+                .filter_map(|(_, v)| v.get(field).and_then(Value::as_f64))
+                .fold(f64::NEG_INFINITY, f64::max);
+            MetricResult::Scalar(if m.is_finite() { m } else { 0.0 })
+        }
+        Metric::CountDistinct { field } => {
+            let distinct: std::collections::BTreeSet<String> = records
+                .iter()
+                .filter(|(_, v)| passes(v))
+                .filter_map(|(_, v)| field_as_text(v, field).filter(|s| !s.is_empty()))
+                .collect();
+            MetricResult::Scalar(distinct.len() as f64)
+        }
+        Metric::GroupBy { field } => {
+            let mut counts: BTreeMap<String, usize> = BTreeMap::new();
+            for (_, v) in records.iter().filter(|(_, v)| passes(v)) {
+                let key = field_as_text(v, field).unwrap_or_else(|| "(vacío)".to_string());
+                *counts.entry(key).or_default() += 1;
+            }
+            let mut ranked: Vec<(String, usize)> = counts.into_iter().collect();
+            // Mayor conteo primero; empates ordenados por nombre.
+            ranked.sort_by(|a, b| b.1.cmp(&a.1).then_with(|| a.0.cmp(&b.0)));
+            MetricResult::Breakdown(ranked)
+        }
+        Metric::SumBy { group, value } => {
+            MetricResult::ValueBreakdown(grouped_aggregate(records, &passes, group, value, false))
+        }
+        Metric::AvgBy { group, value } => {
+            MetricResult::ValueBreakdown(grouped_aggregate(records, &passes, group, value, true))
+        }
+        Metric::SumBySeries {
+            group,
+            series,
+            value,
+        } => series_aggregate(records, &passes, group, series, value),
+    }
+}
+
+/// Acumula `value` por cada combinación de `group` × `series`,
+/// devolviendo un [`MetricResult::MultiBreakdown`]: el eje `groups`
+/// ordenado por total descendente y, por cada serie, sus valores
+/// alineados 1:1 con `groups` (0.0 donde no hay datos). Las series
+/// también se ordenan por total descendente.
+fn series_aggregate(
+    records: &[(Uuid, Value)],
+    passes: &impl Fn(&Value) -> bool,
+    group: &str,
+    series: &str,
+    value: &str,
+) -> MetricResult {
+    // (grupo, serie) → suma.
+    let mut acc: BTreeMap<(String, String), f64> = BTreeMap::new();
+    // Totales para ordenar ejes.
+    let mut group_total: BTreeMap<String, f64> = BTreeMap::new();
+    let mut series_total: BTreeMap<String, f64> = BTreeMap::new();
+    for (_, v) in records.iter().filter(|(_, v)| passes(v)) {
+        let Some(n) = v.get(value).and_then(Value::as_f64) else {
+            continue;
+        };
+        let g = field_as_text(v, group).unwrap_or_else(|| "(vacío)".to_string());
+        let s = field_as_text(v, series).unwrap_or_else(|| "(vacío)".to_string());
+        *acc.entry((g.clone(), s.clone())).or_default() += n;
+        *group_total.entry(g).or_default() += n;
+        *series_total.entry(s).or_default() += n;
+    }
+    // Ejes ordenados por total desc, empates por nombre.
+    let rank = |m: BTreeMap<String, f64>| -> Vec<String> {
+        let mut v: Vec<(String, f64)> = m.into_iter().collect();
+        v.sort_by(|a, b| {
+            b.1.partial_cmp(&a.1)
+                .unwrap_or(Ordering::Equal)
+                .then_with(|| a.0.cmp(&b.0))
+        });
+        v.into_iter().map(|(k, _)| k).collect()
+    };
+    let groups = rank(group_total);
+    let series_keys = rank(series_total);
+    let series: Vec<(String, Vec<f64>)> = series_keys
+        .into_iter()
+        .map(|s| {
+            let row = groups
+                .iter()
+                .map(|g| acc.get(&(g.clone(), s.clone())).copied().unwrap_or(0.0))
+                .collect();
+            (s, row)
+        })
+        .collect();
+    MetricResult::MultiBreakdown { groups, series }
+}
+
+/// Acumula `value` por cada valor distinto de `group`, devolviendo la
+/// suma (`avg = false`) o el promedio (`avg = true`) por grupo,
+/// ordenado de mayor a menor (empates por nombre de grupo).
+fn grouped_aggregate(
+    records: &[(Uuid, Value)],
+    passes: &impl Fn(&Value) -> bool,
+    group: &str,
+    value: &str,
+    avg: bool,
+) -> Vec<(String, f64)> {
+    // (suma, cuenta-de-numéricos) por grupo.
+    let mut acc: BTreeMap<String, (f64, usize)> = BTreeMap::new();
+    for (_, v) in records.iter().filter(|(_, v)| passes(v)) {
+        let key = field_as_text(v, group).unwrap_or_else(|| "(vacío)".to_string());
+        let entry = acc.entry(key).or_insert((0.0, 0));
+        if let Some(n) = v.get(value).and_then(Value::as_f64) {
+            entry.0 += n;
+            entry.1 += 1;
+        }
+    }
+    let mut ranked: Vec<(String, f64)> = acc
+        .into_iter()
+        .map(|(k, (sum, count))| {
+            let out = if avg && count > 0 {
+                sum / count as f64
+            } else if avg {
+                0.0
+            } else {
+                sum
+            };
+            (k, out)
+        })
+        .collect();
+    ranked.sort_by(|a, b| {
+        b.1.partial_cmp(&a.1)
+            .unwrap_or(std::cmp::Ordering::Equal)
+            .then_with(|| a.0.cmp(&b.0))
+    });
+    ranked
+}
+
+/// Versión pública del predicado de filtro: decide si un record entra
+/// dado un [`CardFilter`]. Útil para componer filtros fuera del motor
+/// (p.ej. controles interactivos que pre-filtran los records).
+pub fn record_matches(v: &Value, f: &CardFilter) -> bool {
+    filter_passes(v, f)
+}
+
+/// Decide si un record pasa el filtro de una tarjeta. Las comparaciones
+/// de orden (`gt`/`lt`/`between`) son numéricas cuando ambos lados
+/// parsean como número, y lexicográficas si no — lo que cubre rangos
+/// de fecha en ISO-8601 sin parser de fechas.
+fn filter_passes(v: &Value, f: &CardFilter) -> bool {
+    let cell = field_as_text(v, &f.field);
+    match f.op {
+        FilterOp::Eq => cell.as_deref() == f.value.as_deref(),
+        FilterOp::Ne => cell.as_deref() != f.value.as_deref(),
+        FilterOp::NonEmpty => cell.map(|s| !s.is_empty()).unwrap_or(false),
+        FilterOp::Gt | FilterOp::Gte | FilterOp::Lt | FilterOp::Lte => {
+            let (Some(cell), Some(bound)) = (cell, f.value.as_ref()) else {
+                return false;
+            };
+            let ord = cmp_text(&cell, bound);
+            match f.op {
+                FilterOp::Gt => ord == Ordering::Greater,
+                FilterOp::Gte => ord != Ordering::Less,
+                FilterOp::Lt => ord == Ordering::Less,
+                FilterOp::Lte => ord != Ordering::Greater,
+                _ => unreachable!(),
+            }
+        }
+        FilterOp::Between => {
+            let Some(cell) = cell else {
+                return false;
+            };
+            let lo_ok = f
+                .min
+                .as_ref()
+                .map_or(true, |lo| cmp_text(&cell, lo) != Ordering::Less);
+            let hi_ok = f
+                .max
+                .as_ref()
+                .map_or(true, |hi| cmp_text(&cell, hi) != Ordering::Greater);
+            lo_ok && hi_ok
+        }
+    }
+}
+
+/// Orden entre dos valores como texto: numérico si ambos parsean,
+/// lexicográfico en caso contrario.
+fn cmp_text(a: &str, b: &str) -> Ordering {
+    match (a.parse::<f64>(), b.parse::<f64>()) {
+        (Ok(x), Ok(y)) => x.partial_cmp(&y).unwrap_or(Ordering::Equal),
+        _ => a.cmp(b),
+    }
+}
+
+/// Serializa un desglose (`Breakdown` conteo o `ValueBreakdown` valor)
+/// a CSV de dos columnas. `value_header` rotula la segunda columna.
+/// Reusa el `to_csv` del runtime para el quoting.
+pub fn breakdown_to_csv(
+    result: &MetricResult,
+    group_header: &str,
+    value_header: &str,
+) -> Option<String> {
+    let rows: Vec<Vec<String>> = match result {
+        MetricResult::Breakdown(rows) => rows
+            .iter()
+            .map(|(k, n)| vec![k.clone(), n.to_string()])
+            .collect(),
+        MetricResult::ValueBreakdown(rows) => rows
+            .iter()
+            .map(|(k, v)| {
+                let n = if v.fract() == 0.0 {
+                    format!("{}", *v as i64)
+                } else {
+                    v.to_string()
+                };
+                vec![k.clone(), n]
+            })
+            .collect(),
+        // Matriz: una columna por serie. `value_header` se ignora — los
+        // encabezados de valor son los nombres de las series.
+        MetricResult::MultiBreakdown { groups, series } => {
+            let mut headers = vec![group_header.to_string()];
+            headers.extend(series.iter().map(|(name, _)| name.clone()));
+            let rows: Vec<Vec<String>> = groups
+                .iter()
+                .enumerate()
+                .map(|(i, g)| {
+                    let mut row = vec![g.clone()];
+                    for (_, vals) in series {
+                        let v = vals.get(i).copied().unwrap_or(0.0);
+                        let n = if v.fract() == 0.0 {
+                            format!("{}", v as i64)
+                        } else {
+                            v.to_string()
+                        };
+                        row.push(n);
+                    }
+                    row
+                })
+                .collect();
+            return Some(crate::csv::to_csv(&headers, &rows));
+        }
+        MetricResult::Scalar(_) => return None,
+    };
+    Some(crate::csv::to_csv(
+        &[group_header.to_string(), value_header.to_string()],
+        &rows,
+    ))
+}
+
+/// Etiqueta de la fila que agrupa el resto de un desglose recortado.
+pub const OTROS_LABEL: &str = "Otros";
+
+/// Recorta un desglose a sus `limit` filas de mayor valor (el motor ya
+/// las entrega ordenadas de mayor a menor) y colapsa el resto en una
+/// fila [`OTROS_LABEL`]. Devuelve `true` si efectivamente agregó esa
+/// fila (hubo más de `limit` grupos), para que la capa de presentación
+/// la marque como no-navegable.
+///
+/// El valor de "Otros" es la **suma** del resto para conteos
+/// (`GroupBy`) y para sumas (`SumBy`, `additive = true`); para
+/// promedios (`AvgBy`, `additive = false`) es el promedio aritmético de
+/// los valores de los grupos restantes (aproximación clara: la fila
+/// "Otros" no es un grupo real). `limit == 0` no recorta nada.
+pub fn limit_breakdown(result: &mut MetricResult, limit: usize, additive: bool) -> bool {
+    if limit == 0 {
+        return false;
+    }
+    match result {
+        MetricResult::Breakdown(rows) if rows.len() > limit => {
+            let tail: usize = rows[limit..].iter().map(|(_, n)| *n).sum();
+            rows.truncate(limit);
+            rows.push((OTROS_LABEL.to_string(), tail));
+            true
+        }
+        MetricResult::ValueBreakdown(rows) if rows.len() > limit => {
+            let rest = &rows[limit..];
+            let value = if additive {
+                rest.iter().map(|(_, v)| *v).sum()
+            } else {
+                let sum: f64 = rest.iter().map(|(_, v)| *v).sum();
+                sum / rest.len() as f64
+            };
+            rows.truncate(limit);
+            rows.push((OTROS_LABEL.to_string(), value));
+            true
+        }
+        // El recorte top-N no aplica a desgloses de dos dimensiones.
+        _ => false,
+    }
+}
+
+/// Trunca una fecha ISO-8601 a la granularidad pedida, para agrupar
+/// series temporales (`2026-01-15T10:30Z` / `2026-01-15` → `2026`,
+/// `2026-01` o `2026-01-15`). Si `raw` no empieza con un año de 4
+/// dígitos seguido de `-` (o no es una fecha reconocible), se devuelve
+/// sin cambios — el bucketing es inofensivo sobre datos no-fecha.
+pub fn bucket_date(raw: &str, bucket: DateBucket) -> String {
+    // Reconocer el prefijo `YYYY-`: 4 dígitos + guión.
+    let looks_like_date = raw.len() >= 5
+        && raw.as_bytes()[..4].iter().all(u8::is_ascii_digit)
+        && raw.as_bytes()[4] == b'-';
+    if !looks_like_date {
+        return raw.to_string();
+    }
+    // Fecha = los primeros 10 chars (`YYYY-MM-DD`) si los hay.
+    let date = raw.get(0..10).unwrap_or(raw);
+    let end = match bucket {
+        DateBucket::Year => 4,
+        DateBucket::Month => 7,
+        DateBucket::Day => 10,
+    };
+    date.get(0..end).unwrap_or(date).to_string()
+}
+
+/// Reordena las filas de un desglose por su clave de grupo ascendente
+/// (lexicográfico — coincide con el orden cronológico para claves ISO
+/// de [`bucket_date`]). No-op sobre escalares.
+pub fn sort_breakdown_by_key(result: &mut MetricResult) {
+    match result {
+        MetricResult::Breakdown(rows) => rows.sort_by(|a, b| a.0.cmp(&b.0)),
+        MetricResult::ValueBreakdown(rows) => rows.sort_by(|a, b| a.0.cmp(&b.0)),
+        // Reordena el eje `groups` por clave y permuta cada serie con la
+        // misma permutación, manteniendo la alineación 1:1.
+        MetricResult::MultiBreakdown { groups, series } => {
+            let mut perm: Vec<usize> = (0..groups.len()).collect();
+            perm.sort_by(|&a, &b| groups[a].cmp(&groups[b]));
+            *groups = perm.iter().map(|&i| groups[i].clone()).collect();
+            for (_, vals) in series.iter_mut() {
+                *vals = perm.iter().map(|&i| vals[i]).collect();
+            }
+        }
+        MetricResult::Scalar(_) => {}
+    }
+}
+
+/// Reescribe un desglose ordenado a su **acumulado** (running total):
+/// cada valor pasa a ser la suma corrida de sí mismo y todos los
+/// anteriores. Pensado para series temporales (orden cronológico, vía
+/// `bucket`) — p.ej. el saldo acumulado de tesorería mes a mes. En
+/// multi-serie, cada serie acumula de forma independiente a lo largo
+/// del eje de grupos. `Breakdown` (conteo) se acumula igual. No-op
+/// sobre `Scalar`. Asume que `result` ya está en el orden deseado
+/// (típicamente tras `sort_breakdown_by_key`); sólo tiene sentido sobre
+/// métricas aditivas (`Count`/`Sum`).
+pub fn cumulative_breakdown(result: &mut MetricResult) {
+    match result {
+        MetricResult::Breakdown(rows) => {
+            let mut acc = 0usize;
+            for (_, v) in rows.iter_mut() {
+                acc += *v;
+                *v = acc;
+            }
+        }
+        MetricResult::ValueBreakdown(rows) => {
+            let mut acc = 0.0;
+            for (_, v) in rows.iter_mut() {
+                acc += *v;
+                *v = acc;
+            }
+        }
+        MetricResult::MultiBreakdown { series, .. } => {
+            for (_, vals) in series.iter_mut() {
+                let mut acc = 0.0;
+                for v in vals.iter_mut() {
+                    acc += *v;
+                    *v = acc;
+                }
+            }
+        }
+        MetricResult::Scalar(_) => {}
+    }
+}
+
+/// Valor de un campo de nivel superior como texto plano, para comparar
+/// (filtros) o agrupar (`GroupBy`).
+fn field_as_text(v: &Value, field: &str) -> Option<String> {
+    match v.get(field)? {
+        Value::Null => None,
+        Value::String(s) => Some(s.clone()),
+        other => Some(other.to_string()),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use serde_json::json;
+
+    fn recs(items: &[Value]) -> Vec<(Uuid, Value)> {
+        items.iter().map(|v| (Uuid::new_v4(), v.clone())).collect()
+    }
+
+    #[test]
+    fn bucket_date_truncates_iso() {
+        assert_eq!(bucket_date("2026-01-15", DateBucket::Year), "2026");
+        assert_eq!(bucket_date("2026-01-15", DateBucket::Month), "2026-01");
+        assert_eq!(bucket_date("2026-01-15", DateBucket::Day), "2026-01-15");
+        // Con hora.
+        assert_eq!(bucket_date("2026-03-09T10:30:00Z", DateBucket::Month), "2026-03");
+        // No-fecha → sin cambios (inofensivo).
+        assert_eq!(bucket_date("activo", DateBucket::Month), "activo");
+        assert_eq!(bucket_date("", DateBucket::Year), "");
+    }
+
+    #[test]
+    fn sort_breakdown_by_key_is_chronological_for_iso() {
+        let mut r = MetricResult::ValueBreakdown(vec![
+            ("2026-03".into(), 30.0),
+            ("2026-01".into(), 10.0),
+            ("2026-02".into(), 20.0),
+        ]);
+        sort_breakdown_by_key(&mut r);
+        assert_eq!(
+            r,
+            MetricResult::ValueBreakdown(vec![
+                ("2026-01".into(), 10.0),
+                ("2026-02".into(), 20.0),
+                ("2026-03".into(), 30.0),
+            ])
+        );
+    }
+
+    #[test]
+    fn cumulative_breakdown_running_total() {
+        // Serie de valores → saldo acumulado.
+        let mut r = MetricResult::ValueBreakdown(vec![
+            ("2026-01".into(), 10.0),
+            ("2026-02".into(), 20.0),
+            ("2026-03".into(), 5.0),
+        ]);
+        cumulative_breakdown(&mut r);
+        assert_eq!(
+            r,
+            MetricResult::ValueBreakdown(vec![
+                ("2026-01".into(), 10.0),
+                ("2026-02".into(), 30.0),
+                ("2026-03".into(), 35.0),
+            ])
+        );
+        // Conteo acumulado.
+        let mut c = MetricResult::Breakdown(vec![("a".into(), 2), ("b".into(), 3), ("c".into(), 1)]);
+        cumulative_breakdown(&mut c);
+        assert_eq!(
+            c,
+            MetricResult::Breakdown(vec![("a".into(), 2), ("b".into(), 5), ("c".into(), 6)])
+        );
+        // Multi-serie: cada serie acumula por separado.
+        let mut m = MetricResult::MultiBreakdown {
+            groups: vec!["ene".into(), "feb".into(), "mar".into()],
+            series: vec![
+                ("pagado".into(), vec![1.0, 2.0, 3.0]),
+                ("no".into(), vec![10.0, 0.0, 5.0]),
+            ],
+        };
+        cumulative_breakdown(&mut m);
+        assert_eq!(
+            m,
+            MetricResult::MultiBreakdown {
+                groups: vec!["ene".into(), "feb".into(), "mar".into()],
+                series: vec![
+                    ("pagado".into(), vec![1.0, 3.0, 6.0]),
+                    ("no".into(), vec![10.0, 10.0, 15.0]),
+                ],
+            }
+        );
+        // No-op sobre escalar.
+        let mut s = MetricResult::Scalar(42.0);
+        cumulative_breakdown(&mut s);
+        assert_eq!(s, MetricResult::Scalar(42.0));
+    }
+
+    #[test]
+    fn limit_breakdown_counts_sums_the_tail() {
+        let mut r = MetricResult::Breakdown(vec![
+            ("a".into(), 10),
+            ("b".into(), 6),
+            ("c".into(), 3),
+            ("d".into(), 1),
+        ]);
+        let collapsed = limit_breakdown(&mut r, 2, true);
+        assert!(collapsed);
+        assert_eq!(
+            r,
+            MetricResult::Breakdown(vec![
+                ("a".into(), 10),
+                ("b".into(), 6),
+                (OTROS_LABEL.into(), 4), // 3 + 1
+            ])
+        );
+    }
+
+    #[test]
+    fn limit_breakdown_avg_bucket_is_mean_not_sum() {
+        let mut r = MetricResult::ValueBreakdown(vec![
+            ("a".into(), 100.0),
+            ("b".into(), 80.0),
+            ("c".into(), 60.0),
+            ("d".into(), 40.0),
+        ]);
+        // additive = false (AvgBy): el bucket promedia los restantes.
+        let collapsed = limit_breakdown(&mut r, 2, false);
+        assert!(collapsed);
+        assert_eq!(
+            r,
+            MetricResult::ValueBreakdown(vec![
+                ("a".into(), 100.0),
+                ("b".into(), 80.0),
+                (OTROS_LABEL.into(), 50.0), // (60 + 40) / 2
+            ])
+        );
+    }
+
+    #[test]
+    fn limit_breakdown_noop_when_within_limit() {
+        let mut r = MetricResult::Breakdown(vec![("a".into(), 3), ("b".into(), 1)]);
+        let before = r.clone();
+        assert!(!limit_breakdown(&mut r, 5, true));
+        assert!(!limit_breakdown(&mut r, 0, true));
+        assert_eq!(r, before);
+    }
+
+    #[test]
+    fn count_all_and_filtered() {
+        let rs = recs(&[
+            json!({"etapa": "ganada"}),
+            json!({"etapa": "ganada"}),
+            json!({"etapa": "perdida"}),
+        ]);
+        assert_eq!(
+            compute_metric(&Metric::Count, None, &rs),
+            MetricResult::Scalar(3.0)
+        );
+        let f = CardFilter {
+            field: "etapa".into(),
+            op: FilterOp::Eq,
+            value: Some("ganada".into()),
+            min: None,
+            max: None,
+        };
+        assert_eq!(
+            compute_metric(&Metric::Count, Some(&f), &rs),
+            MetricResult::Scalar(2.0)
+        );
+    }
+
+    #[test]
+    fn count_distinct_counts_unique_non_empty_values() {
+        let rs = recs(&[
+            json!({"cliente": "acme"}),
+            json!({"cliente": "acme"}),
+            json!({"cliente": "globex"}),
+            json!({"cliente": ""}),      // vacío → no cuenta
+            json!({"otro": "x"}),        // sin el campo → no cuenta
+        ]);
+        assert_eq!(
+            compute_metric(&Metric::CountDistinct { field: "cliente".into() }, None, &rs),
+            MetricResult::Scalar(2.0) // acme, globex
+        );
+        // Con filtro: sólo los records que pasan entran al set distinto.
+        let f = CardFilter {
+            field: "cliente".into(),
+            op: FilterOp::Eq,
+            value: Some("acme".into()),
+            min: None,
+            max: None,
+        };
+        assert_eq!(
+            compute_metric(&Metric::CountDistinct { field: "cliente".into() }, Some(&f), &rs),
+            MetricResult::Scalar(1.0)
+        );
+    }
+
+    fn filt(field: &str, op: FilterOp, value: Option<&str>) -> CardFilter {
+        CardFilter {
+            field: field.into(),
+            op,
+            value: value.map(Into::into),
+            min: None,
+            max: None,
+        }
+    }
+
+    #[test]
+    fn numeric_range_filters() {
+        let rs = recs(&[
+            json!({"monto": 100}),
+            json!({"monto": 500}),
+            json!({"monto": 900}),
+        ]);
+        // gte 500 → 500 y 900.
+        assert_eq!(
+            compute_metric(&Metric::Count, Some(&filt("monto", FilterOp::Gte, Some("500"))), &rs),
+            MetricResult::Scalar(2.0)
+        );
+        // lt 500 → solo 100.
+        assert_eq!(
+            compute_metric(&Metric::Count, Some(&filt("monto", FilterOp::Lt, Some("500"))), &rs),
+            MetricResult::Scalar(1.0)
+        );
+        // between [200, 800] → solo 500.
+        let between = CardFilter {
+            field: "monto".into(),
+            op: FilterOp::Between,
+            value: None,
+            min: Some("200".into()),
+            max: Some("800".into()),
+        };
+        assert_eq!(
+            compute_metric(&Metric::Count, Some(&between), &rs),
+            MetricResult::Scalar(1.0)
+        );
+    }
+
+    #[test]
+    fn date_range_is_lexicographic() {
+        let rs = recs(&[
+            json!({"fecha": "2026-01-15"}),
+            json!({"fecha": "2026-06-30"}),
+            json!({"fecha": "2027-02-01"}),
+        ]);
+        let q1_h1 = CardFilter {
+            field: "fecha".into(),
+            op: FilterOp::Between,
+            value: None,
+            min: Some("2026-01-01".into()),
+            max: Some("2026-12-31".into()),
+        };
+        assert_eq!(
+            compute_metric(&Metric::Count, Some(&q1_h1), &rs),
+            MetricResult::Scalar(2.0)
+        );
+    }
+
+    #[test]
+    fn non_empty_filter() {
+        let rs = recs(&[json!({"nota": "x"}), json!({"nota": ""}), json!({"otro": 1})]);
+        assert_eq!(
+            compute_metric(&Metric::Count, Some(&filt("nota", FilterOp::NonEmpty, None)), &rs),
+            MetricResult::Scalar(1.0)
+        );
+    }
+
+    #[test]
+    fn breakdown_csv_roundtrip() {
+        let res = MetricResult::ValueBreakdown(vec![
+            ("ACME".into(), 1500.0),
+            ("Globex".into(), 2000.0),
+        ]);
+        let csv = breakdown_to_csv(&res, "Cliente", "Monto").unwrap();
+        assert_eq!(csv, "Cliente,Monto\nACME,1500\nGlobex,2000\n");
+        assert!(breakdown_to_csv(&MetricResult::Scalar(1.0), "a", "b").is_none());
+    }
+
+    #[test]
+    fn sum_skips_missing_and_non_numeric() {
+        let rs = recs(&[
+            json!({"monto": 1000}),
+            json!({"monto": 2500}),
+            json!({"otro": 1}),
+        ]);
+        assert_eq!(
+            compute_metric(
+                &Metric::Sum {
+                    field: "monto".into()
+                },
+                None,
+                &rs
+            ),
+            MetricResult::Scalar(3500.0)
+        );
+    }
+
+    #[test]
+    fn group_by_counts_and_ranks_by_frequency() {
+        let rs = recs(&[
+            json!({"etapa": "prospecto"}),
+            json!({"etapa": "ganada"}),
+            json!({"etapa": "ganada"}),
+        ]);
+        assert_eq!(
+            compute_metric(
+                &Metric::GroupBy {
+                    field: "etapa".into()
+                },
+                None,
+                &rs
+            ),
+            MetricResult::Breakdown(vec![
+                ("ganada".to_string(), 2),
+                ("prospecto".to_string(), 1),
+            ])
+        );
+    }
+
+    #[test]
+    fn avg_min_max_over_numeric() {
+        let rs = recs(&[
+            json!({"monto": 100}),
+            json!({"monto": 300}),
+            json!({"otro": 1}), // ignorado
+        ]);
+        assert_eq!(
+            compute_metric(&Metric::Avg { field: "monto".into() }, None, &rs),
+            MetricResult::Scalar(200.0)
+        );
+        assert_eq!(
+            compute_metric(&Metric::Min { field: "monto".into() }, None, &rs),
+            MetricResult::Scalar(100.0)
+        );
+        assert_eq!(
+            compute_metric(&Metric::Max { field: "monto".into() }, None, &rs),
+            MetricResult::Scalar(300.0)
+        );
+    }
+
+    #[test]
+    fn avg_empty_is_zero_not_nan() {
+        let rs = recs(&[json!({"otro": 1})]);
+        assert_eq!(
+            compute_metric(&Metric::Avg { field: "monto".into() }, None, &rs),
+            MetricResult::Scalar(0.0)
+        );
+        assert_eq!(
+            compute_metric(&Metric::Min { field: "monto".into() }, None, &rs),
+            MetricResult::Scalar(0.0)
+        );
+    }
+
+    #[test]
+    fn sum_by_aggregates_and_ranks_by_value() {
+        let rs = recs(&[
+            json!({"cliente": "ACME", "monto": 1000}),
+            json!({"cliente": "ACME", "monto": 500}),
+            json!({"cliente": "Globex", "monto": 2000}),
+        ]);
+        assert_eq!(
+            compute_metric(
+                &Metric::SumBy {
+                    group: "cliente".into(),
+                    value: "monto".into()
+                },
+                None,
+                &rs
+            ),
+            MetricResult::ValueBreakdown(vec![
+                ("Globex".to_string(), 2000.0),
+                ("ACME".to_string(), 1500.0),
+            ])
+        );
+    }
+
+    #[test]
+    fn sum_by_series_builds_aligned_matrix() {
+        let rs = recs(&[
+            json!({"mes": "2026-01", "plan": "pro", "monto": 100}),
+            json!({"mes": "2026-01", "plan": "free", "monto": 30}),
+            json!({"mes": "2026-02", "plan": "pro", "monto": 200}),
+            // free no factura en feb → 0.0 alineado.
+        ]);
+        let r = compute_metric(
+            &Metric::SumBySeries {
+                group: "mes".into(),
+                series: "plan".into(),
+                value: "monto".into(),
+            },
+            None,
+            &rs,
+        );
+        // groups por total desc: feb(200) > ene(130). series por total
+        // desc: pro(300) > free(30).
+        assert_eq!(
+            r,
+            MetricResult::MultiBreakdown {
+                groups: vec!["2026-02".into(), "2026-01".into()],
+                series: vec![
+                    ("pro".into(), vec![200.0, 100.0]),
+                    ("free".into(), vec![0.0, 30.0]),
+                ],
+            }
+        );
+    }
+
+    #[test]
+    fn sort_multi_breakdown_permutes_series() {
+        let mut r = MetricResult::MultiBreakdown {
+            groups: vec!["2026-02".into(), "2026-01".into()],
+            series: vec![
+                ("pro".into(), vec![200.0, 100.0]),
+                ("free".into(), vec![0.0, 30.0]),
+            ],
+        };
+        sort_breakdown_by_key(&mut r);
+        // groups cronológicos; cada serie sigue la misma permutación.
+        assert_eq!(
+            r,
+            MetricResult::MultiBreakdown {
+                groups: vec!["2026-01".into(), "2026-02".into()],
+                series: vec![
+                    ("pro".into(), vec![100.0, 200.0]),
+                    ("free".into(), vec![30.0, 0.0]),
+                ],
+            }
+        );
+    }
+
+    #[test]
+    fn multi_breakdown_csv_is_a_matrix() {
+        let r = MetricResult::MultiBreakdown {
+            groups: vec!["2026-01".into(), "2026-02".into()],
+            series: vec![
+                ("pro".into(), vec![100.0, 200.0]),
+                ("free".into(), vec![30.0, 0.0]),
+            ],
+        };
+        let csv = breakdown_to_csv(&r, "Mes", "ignorado").unwrap();
+        assert_eq!(csv, "Mes,pro,free\n2026-01,100,30\n2026-02,200,0\n");
+    }
+
+    #[test]
+    fn avg_by_is_per_group_mean() {
+        let rs = recs(&[
+            json!({"plan": "pro", "monto": 100}),
+            json!({"plan": "pro", "monto": 300}),
+            json!({"plan": "free", "monto": 50}),
+        ]);
+        assert_eq!(
+            compute_metric(
+                &Metric::AvgBy {
+                    group: "plan".into(),
+                    value: "monto".into()
+                },
+                None,
+                &rs
+            ),
+            MetricResult::ValueBreakdown(vec![
+                ("pro".to_string(), 200.0),
+                ("free".to_string(), 50.0),
+            ])
+        );
+    }
+}
diff --git a/02_ruway/nahual/libs/meta-runtime/src/parse.rs b/02_ruway/nahual/libs/meta-runtime/src/parse.rs
new file mode 100644
index 0000000..5a94aba
--- /dev/null
+++ b/02_ruway/nahual/libs/meta-runtime/src/parse.rs
@@ -0,0 +1,263 @@
+//! Parseo de inputs del form a `serde_json::Value` tipado.
+
+use serde_json::{json, Value};
+use uuid::Uuid;
+
+use nahual_meta_schema::{FieldKind, FieldSpec};
+
+/// Convierte el texto raw de un input al `Value` tipado según el
+/// `kind` del spec.
+///
+/// - `Text` / `Multiline` / `Date` → string passthrough.
+/// - `EntityRef` → string del UUID **trimmed**, validado como UUID
+///   parseable. Falla con mensaje claro si no parsea.
+/// - `Boolean` → variantes comunes (`true/yes/1/on/y` y `false/no/0/off/n`).
+/// - `Number` → i64 si parsea, sino f64.
+pub fn parse_field_value(kind: FieldKind, raw: &str) -> Result<Value, String> {
+    match kind {
+        // Select y AutoId guardan un string: el valor de la opción
+        // elegida y el UUID autogenerado, respectivamente.
+        FieldKind::Text
+        | FieldKind::Multiline
+        | FieldKind::Date
+        | FieldKind::Select
+        | FieldKind::AutoId => Ok(json!(raw)),
+        // EntityRef se almacena como string del UUID seleccionado.
+        // El selector clickable garantiza UUIDs válidos en happy
+        // path; este check protege paste manual o garbage tipeado.
+        FieldKind::EntityRef => {
+            let trimmed = raw.trim();
+            Uuid::parse_str(trimmed)
+                .map_err(|_| format!("'{raw}' no es UUID válido (usá el selector de records)"))?;
+            Ok(json!(trimmed))
+        }
+        FieldKind::Boolean => match raw.to_ascii_lowercase().as_str() {
+            "true" | "yes" | "1" | "on" | "y" => Ok(json!(true)),
+            "" | "false" | "no" | "0" | "off" | "n" => Ok(json!(false)),
+            other => Err(format!("'{other}' no es booleano")),
+        },
+        FieldKind::Number => {
+            if let Ok(i) = raw.parse::<i64>() {
+                Ok(json!(i))
+            } else if let Ok(f) = raw.parse::<f64>() {
+                Ok(json!(f))
+            } else {
+                Err(format!("'{raw}' no es número"))
+            }
+        }
+    }
+}
+
+/// Resuelve un param de morphism a su `Value` según el `FieldSpec`
+/// del form. **Strict path**: si hay spec, valida `required` y parsea
+/// con el `kind` declarado (ej. Boolean rebota con "abc" antes de
+/// llegar al morphism). **Fallback path**: si no hay spec (param
+/// declarado en `Action::Morphism.params` que no aparece en
+/// `form.fields`), usa la heurística [`infer_param_value`] para no
+/// quedar atado a un schema mal-formado.
+///
+/// Errores tienen el label legible del spec, así el toast de la UI
+/// es interpretable.
+pub fn resolve_param_value(
+    field_name: &str,
+    raw: &str,
+    spec: Option<&FieldSpec>,
+) -> Result<Value, String> {
+    let Some(s) = spec else {
+        return Ok(infer_param_value(raw));
+    };
+
+    let label = if s.label.is_empty() {
+        field_name
+    } else {
+        &s.label
+    };
+
+    if s.required && raw.trim().is_empty() {
+        return Err(format!("param '{label}' es obligatorio y está vacío"));
+    }
+    if raw.is_empty() && !s.required {
+        return Ok(Value::Null);
+    }
+    parse_field_value(s.kind, raw).map_err(|e| format!("param '{label}': {e}"))
+}
+
+/// Inferencia de tipo para values pasados como `params` a un
+/// morphism. Usada como fallback en [`resolve_param_value`] cuando el
+/// param declarado en `Action::Morphism.params` no aparece en los
+/// `form.fields` (módulo mal-formado).
+///
+/// Heurística simple: int → i64, float → f64, "true"/"false" → bool,
+/// resto → string.
+pub fn infer_param_value(raw: &str) -> Value {
+    if raw.is_empty() {
+        return Value::Null;
+    }
+    if let Ok(i) = raw.parse::<i64>() {
+        return json!(i);
+    }
+    if let Ok(f) = raw.parse::<f64>() {
+        return json!(f);
+    }
+    match raw {
+        "true" => return json!(true),
+        "false" => return json!(false),
+        _ => {}
+    }
+    json!(raw)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use nahual_meta_schema::FieldSpec;
+
+    fn spec(name: &str, kind: FieldKind, required: bool) -> FieldSpec {
+        FieldSpec {
+            name: name.into(),
+            label: name.into(),
+            kind,
+            default: None,
+            required,
+            help: None,
+            ref_entity: None,
+            options: Vec::new(),
+            section: None,
+        }
+    }
+
+    #[test]
+    fn infer_handles_basic_types() {
+        assert_eq!(infer_param_value(""), Value::Null);
+        assert_eq!(infer_param_value("42"), json!(42));
+        assert_eq!(infer_param_value("2.5"), json!(2.5));
+        assert_eq!(infer_param_value("true"), json!(true));
+        assert_eq!(infer_param_value("false"), json!(false));
+        assert_eq!(infer_param_value("hola"), json!("hola"));
+    }
+
+    #[test]
+    fn parse_text_passthrough() {
+        let v = parse_field_value(FieldKind::Text, "hola").unwrap();
+        assert_eq!(v, json!("hola"));
+    }
+
+    #[test]
+    fn parse_select_and_auto_id_passthrough() {
+        // Select guarda el valor de la opción elegida.
+        assert_eq!(
+            parse_field_value(FieldKind::Select, "ganada").unwrap(),
+            json!("ganada")
+        );
+        // AutoId guarda el UUID autogenerado tal cual.
+        let id = Uuid::new_v4().to_string();
+        assert_eq!(
+            parse_field_value(FieldKind::AutoId, &id).unwrap(),
+            json!(id)
+        );
+    }
+
+    #[test]
+    fn parse_number_i64_or_f64() {
+        assert_eq!(
+            parse_field_value(FieldKind::Number, "42").unwrap(),
+            json!(42)
+        );
+        assert_eq!(
+            parse_field_value(FieldKind::Number, "2.5").unwrap(),
+            json!(2.5)
+        );
+        assert!(parse_field_value(FieldKind::Number, "abc").is_err());
+    }
+
+    #[test]
+    fn parse_boolean_recognizes_variants() {
+        for s in ["true", "yes", "1", "on", "y"] {
+            assert_eq!(
+                parse_field_value(FieldKind::Boolean, s).unwrap(),
+                json!(true)
+            );
+        }
+        for s in ["false", "no", "0", "off", "n", ""] {
+            assert_eq!(
+                parse_field_value(FieldKind::Boolean, s).unwrap(),
+                json!(false)
+            );
+        }
+        assert!(parse_field_value(FieldKind::Boolean, "abc").is_err());
+    }
+
+    #[test]
+    fn parse_entity_ref_accepts_valid_uuid() {
+        let id = Uuid::new_v4();
+        let v = parse_field_value(FieldKind::EntityRef, &id.to_string()).unwrap();
+        assert_eq!(v, json!(id.to_string()));
+    }
+
+    #[test]
+    fn parse_entity_ref_trims_whitespace() {
+        let id = Uuid::new_v4();
+        let padded = format!("  {id}\n");
+        let v = parse_field_value(FieldKind::EntityRef, &padded).unwrap();
+        assert_eq!(v, json!(id.to_string()));
+    }
+
+    #[test]
+    fn parse_entity_ref_rejects_non_uuid() {
+        let err = parse_field_value(FieldKind::EntityRef, "abc-123").unwrap_err();
+        assert!(err.contains("'abc-123'"));
+        assert!(err.contains("UUID") || err.contains("uuid"));
+    }
+
+    #[test]
+    fn parse_entity_ref_rejects_empty_string() {
+        let err = parse_field_value(FieldKind::EntityRef, "").unwrap_err();
+        assert!(err.contains("UUID"));
+    }
+
+    #[test]
+    fn resolve_param_strict_number_parses_i64() {
+        let s = spec("qty", FieldKind::Number, true);
+        let v = resolve_param_value("qty", "42", Some(&s)).unwrap();
+        assert_eq!(v, json!(42));
+    }
+
+    #[test]
+    fn resolve_param_strict_boolean_rejects_non_boolean() {
+        let s = spec("active", FieldKind::Boolean, true);
+        let err = resolve_param_value("active", "abc", Some(&s)).unwrap_err();
+        assert!(err.contains("active"));
+    }
+
+    #[test]
+    fn resolve_param_required_empty_rejected() {
+        let s = spec("name", FieldKind::Text, true);
+        let err = resolve_param_value("name", "   ", Some(&s)).unwrap_err();
+        assert!(err.contains("obligatorio"));
+    }
+
+    #[test]
+    fn resolve_param_optional_empty_returns_null() {
+        let s = spec("notes", FieldKind::Text, false);
+        let v = resolve_param_value("notes", "", Some(&s)).unwrap();
+        assert_eq!(v, Value::Null);
+    }
+
+    #[test]
+    fn resolve_param_no_spec_falls_back_to_infer() {
+        let v = resolve_param_value("foo", "42", None).unwrap();
+        assert_eq!(v, json!(42));
+        let v = resolve_param_value("foo", "true", None).unwrap();
+        assert_eq!(v, json!(true));
+        let v = resolve_param_value("foo", "x", None).unwrap();
+        assert_eq!(v, json!("x"));
+    }
+
+    #[test]
+    fn resolve_param_strict_entity_ref_propagates_error() {
+        let s = spec("stock_ref", FieldKind::EntityRef, true);
+        let err = resolve_param_value("stock_ref", "not-a-uuid", Some(&s)).unwrap_err();
+        assert!(err.contains("stock_ref"));
+        assert!(err.contains("UUID"));
+    }
+}
diff --git a/02_ruway/nahual/libs/meta-runtime/src/refs.rs b/02_ruway/nahual/libs/meta-runtime/src/refs.rs
new file mode 100644
index 0000000..47d679f
--- /dev/null
+++ b/02_ruway/nahual/libs/meta-runtime/src/refs.rs
@@ -0,0 +1,108 @@
+//! Validación cross-field de EntityRefs contra el store actual.
+//!
+//! Decoupling: en vez de un `trait Store` que ate este crate a un
+//! backend específico, tomamos un cierre `load: Fn(&str, Uuid) ->
+//! Option<Value>`. El caller (nakui-ui o cualquier otro runtime)
+//! puede pasarlo trivialmente sobre cualquier store (MemoryStore,
+//! SurrealStore, mock, ...).
+
+use serde_json::Value;
+use uuid::Uuid;
+
+use crate::format::short_uuid;
+
+/// Valida que cada UUID en `refs` apunte a un record que realmente
+/// existe en el store bajo la entity esperada. Devuelve el primer
+/// error encontrado (fail-fast).
+///
+/// `refs` es una lista de `(label, target_entity, uuid)`. El label
+/// va al error message, así que conviene que sea legible (ej:
+/// `FieldSpec.label` en lugar de `FieldSpec.name`).
+///
+/// `load` es el cierre que el caller usa para mirar el store —
+/// típicamente `|e, id| store.load(e, id)`.
+pub fn validate_entity_refs<F>(load: F, refs: &[(String, String, Uuid)]) -> Result<(), String>
+where
+    F: Fn(&str, Uuid) -> Option<Value>,
+{
+    for (label, target, id) in refs {
+        if load(target, *id).is_none() {
+            return Err(format!(
+                "campo '{label}': record {} de '{target}' no existe en el store",
+                short_uuid(id)
+            ));
+        }
+    }
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use serde_json::json;
+    use std::collections::HashMap;
+
+    /// "Mock store" minimalista para tests: HashMap por (entity, uuid).
+    fn mk_load(records: HashMap<(String, Uuid), Value>) -> impl Fn(&str, Uuid) -> Option<Value> {
+        move |e, id| records.get(&(e.to_string(), id)).cloned()
+    }
+
+    #[test]
+    fn passes_when_all_records_exist() {
+        let stock = Uuid::new_v4();
+        let caja = Uuid::new_v4();
+        let mut records = HashMap::new();
+        records.insert(("Stock".into(), stock), json!({"sku_id": "abc"}));
+        records.insert(("Caja".into(), caja), json!({"name": "Principal"}));
+        let load = mk_load(records);
+
+        let refs = vec![
+            ("Stock".into(), "Stock".into(), stock),
+            ("Caja".into(), "Caja".into(), caja),
+        ];
+        assert!(validate_entity_refs(load, &refs).is_ok());
+    }
+
+    #[test]
+    fn fails_on_first_missing() {
+        let stock = Uuid::new_v4();
+        let mut records = HashMap::new();
+        records.insert(("Stock".into(), stock), json!({"sku_id": "abc"}));
+        let load = mk_load(records);
+
+        let missing_caja = Uuid::new_v4();
+        let refs = vec![
+            ("Stock".into(), "Stock".into(), stock),
+            ("Caja".into(), "Caja".into(), missing_caja),
+        ];
+        let err = validate_entity_refs(load, &refs).unwrap_err();
+        assert!(err.contains("Caja"));
+        assert!(err.contains(&short_uuid(&missing_caja)));
+    }
+
+    #[test]
+    fn uses_label_not_entity_in_msg() {
+        let load = |_: &str, _: Uuid| -> Option<Value> { None };
+        let id = Uuid::new_v4();
+        let refs = vec![("Stock origen".into(), "Stock".into(), id)];
+        let err = validate_entity_refs(load, &refs).unwrap_err();
+        assert!(err.contains("Stock origen"));
+    }
+
+    #[test]
+    fn empty_list_is_ok() {
+        let load = |_: &str, _: Uuid| -> Option<Value> { None };
+        assert!(validate_entity_refs(load, &[]).is_ok());
+    }
+
+    #[test]
+    fn distinguishes_target_from_other_entities() {
+        let id = Uuid::new_v4();
+        let mut records = HashMap::new();
+        // Mismo UUID bajo Customer pero NO bajo Stock.
+        records.insert(("Customer".into(), id), json!({"name": "Acme"}));
+        let load = mk_load(records);
+        let refs = vec![("Stock".into(), "Stock".into(), id)];
+        assert!(validate_entity_refs(load, &refs).is_err());
+    }
+}
diff --git a/02_ruway/nahual/libs/meta-runtime/src/testing.rs b/02_ruway/nahual/libs/meta-runtime/src/testing.rs
new file mode 100644
index 0000000..0da13bf
--- /dev/null
+++ b/02_ruway/nahual/libs/meta-runtime/src/testing.rs
@@ -0,0 +1,312 @@
+//! Utilidades de testing para code que consume [`MetaBackend`].
+//!
+//! Provee [`MockBackend`]: implementación in-memory minimalista
+//! del trait, sin acoplamiento a stores reales (event log,
+//! SurrealDB, etc.). Útil para:
+//!
+//! - Tests del widget [`nahual_widget_meta_form::MetaApp`] que
+//!   necesitan un backend funcional sin levantar nakui-core.
+//! - Tests de cualquier consumer que tome `B: MetaBackend` y quiera
+//!   asserts sobre lecturas/escrituras sin tocar disco.
+//! - Fixtures pre-pobladas para demos/screenshots/CI.
+//!
+//! Está bajo `pub mod testing` (no `#[cfg(test)]`) deliberadamente
+//! para que crates downstream puedan importarlo en sus dev/integ
+//! tests. No tiene overhead en producción si no se usa.
+
+use std::collections::{BTreeMap, HashMap};
+
+use serde_json::Value;
+use uuid::Uuid;
+
+use crate::backend::{MetaBackend, WriteOutcome};
+
+/// Backend in-memory para tests. Implementa el contrato completo
+/// del [`MetaBackend`] con semantica simple:
+///
+/// - `seed`: genera Uuid v4, inserta record. `changed = 1`.
+/// - `update`: aplica `set` (overrides) y `clear` (key removal).
+///   Si ambos vacíos → `changed = 0`. Falla si record no existe.
+/// - `delete`: remueve record. Falla si no existe.
+/// - `morphism`: por default rebota con error
+///   `"MockBackend no soporta morphism '<name>'"`. Si querés
+///   simular morphisms, registrá callbacks via
+///   [`MockBackend::with_morphism`].
+/// - `list_records`: orden lexicográfico por id (estable).
+/// - Sin `post_status`: el mock no tiene tick/compact.
+///
+/// Métodos de inspección públicos ([`total_records`],
+/// [`records_for`], etc.) facilitan asserts en tests sin necesidad
+/// de re-leer el state via las APIs del trait.
+pub struct MockBackend {
+    records: HashMap<(String, Uuid), Value>,
+    morphisms: HashMap<String, MorphismHandler>,
+}
+
+type MorphismHandler =
+    Box<dyn Fn(&BTreeMap<String, Uuid>, &Value) -> Result<usize, String> + Send + Sync>;
+
+impl Default for MockBackend {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl MockBackend {
+    /// Backend vacío.
+    pub fn new() -> Self {
+        Self {
+            records: HashMap::new(),
+            morphisms: HashMap::new(),
+        }
+    }
+
+    /// Pre-popula el backend con records `(entity, uuid, data)`.
+    /// Útil para fixtures: asserts sobre lecturas sin tener que
+    /// armar seeds via `seed()`.
+    pub fn with_records<I>(records: I) -> Self
+    where
+        I: IntoIterator<Item = (String, Uuid, Value)>,
+    {
+        let mut b = Self::new();
+        for (entity, id, data) in records {
+            b.records.insert((entity, id), data);
+        }
+        b
+    }
+
+    /// Registra un handler para un morphism de nombre `name`.
+    /// El handler recibe inputs + params y devuelve `changed` o
+    /// `Err` para simular fallo del morphism. Sobrescribe cualquier
+    /// handler previo del mismo nombre.
+    pub fn with_morphism<F>(mut self, name: impl Into<String>, handler: F) -> Self
+    where
+        F: Fn(&BTreeMap<String, Uuid>, &Value) -> Result<usize, String> + Send + Sync + 'static,
+    {
+        self.morphisms.insert(name.into(), Box::new(handler));
+        self
+    }
+
+    /// Cantidad total de records en el backend (todas las entities).
+    pub fn total_records(&self) -> usize {
+        self.records.len()
+    }
+
+    /// Records de una entity como `Vec<(Uuid, &Value)>` sin clones
+    /// (más liviano que `list_records` cuando el caller sólo quiere
+    /// inspeccionar).
+    pub fn records_for<'a>(&'a self, entity: &str) -> Vec<(Uuid, &'a Value)> {
+        self.records
+            .iter()
+            .filter(|((e, _), _)| e == entity)
+            .map(|((_, id), v)| (*id, v))
+            .collect()
+    }
+}
+
+impl MetaBackend for MockBackend {
+    fn list_records(&self, entity: &str) -> Vec<(Uuid, Value)> {
+        let mut out: Vec<(Uuid, Value)> = self
+            .records
+            .iter()
+            .filter(|((e, _), _)| e == entity)
+            .map(|((_, id), v)| (*id, v.clone()))
+            .collect();
+        out.sort_by(|a, b| a.0.as_bytes().cmp(b.0.as_bytes()));
+        out
+    }
+
+    fn load_record(&self, entity: &str, id: Uuid) -> Option<Value> {
+        self.records.get(&(entity.to_string(), id)).cloned()
+    }
+
+    fn seed(
+        &mut self,
+        entity: &str,
+        data: serde_json::Map<String, Value>,
+    ) -> Result<WriteOutcome, String> {
+        let id = Uuid::new_v4();
+        self.records
+            .insert((entity.to_string(), id), Value::Object(data));
+        Ok(WriteOutcome {
+            id: Some(id),
+            changed: 1,
+            post_status: None,
+        })
+    }
+
+    fn update(
+        &mut self,
+        entity: &str,
+        id: Uuid,
+        set: serde_json::Map<String, Value>,
+        clear: Vec<String>,
+    ) -> Result<WriteOutcome, String> {
+        if set.is_empty() && clear.is_empty() {
+            return Ok(WriteOutcome::no_change(id));
+        }
+        let rec = self
+            .records
+            .get_mut(&(entity.to_string(), id))
+            .ok_or_else(|| format!("not found: {entity}/{id}"))?;
+        let map = rec
+            .as_object_mut()
+            .ok_or_else(|| format!("not an object: {entity}/{id}"))?;
+        let changed = set.len() + clear.len();
+        for (k, v) in set {
+            map.insert(k, v);
+        }
+        for k in clear {
+            map.remove(&k);
+        }
+        Ok(WriteOutcome {
+            id: Some(id),
+            changed,
+            post_status: None,
+        })
+    }
+
+    fn delete(&mut self, entity: &str, id: Uuid) -> Result<WriteOutcome, String> {
+        self.records
+            .remove(&(entity.to_string(), id))
+            .ok_or_else(|| format!("not found: {entity}/{id}"))?;
+        Ok(WriteOutcome {
+            id: Some(id),
+            changed: 1,
+            post_status: None,
+        })
+    }
+
+    fn morphism(
+        &mut self,
+        _module_id: &str,
+        name: &str,
+        inputs: BTreeMap<String, Uuid>,
+        params: Value,
+    ) -> Result<WriteOutcome, String> {
+        match self.morphisms.get(name) {
+            Some(handler) => {
+                let changed = handler(&inputs, &params)?;
+                Ok(WriteOutcome {
+                    id: None,
+                    changed,
+                    post_status: None,
+                })
+            }
+            None => Err(format!("MockBackend no soporta morphism '{name}'")),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use serde_json::json;
+
+    fn map_of(items: &[(&str, Value)]) -> serde_json::Map<String, Value> {
+        items
+            .iter()
+            .map(|(k, v)| (k.to_string(), v.clone()))
+            .collect()
+    }
+
+    #[test]
+    fn with_records_populates_state() {
+        let id = Uuid::new_v4();
+        let b = MockBackend::with_records([("Customer".into(), id, json!({"name": "Acme"}))]);
+        assert_eq!(b.total_records(), 1);
+        assert_eq!(b.load_record("Customer", id), Some(json!({"name": "Acme"})));
+    }
+
+    #[test]
+    fn seed_then_load_round_trip_via_trait() {
+        let mut b = MockBackend::new();
+        let out = b.seed("X", map_of(&[("k", json!(1))])).unwrap();
+        let id = out.id.unwrap();
+        assert_eq!(out.changed, 1);
+        assert_eq!(b.load_record("X", id), Some(json!({"k": 1})));
+    }
+
+    #[test]
+    fn update_no_op_returns_no_change() {
+        let id = Uuid::new_v4();
+        let mut b = MockBackend::with_records([("X".into(), id, json!({"k": 1}))]);
+        let out = b.update("X", id, serde_json::Map::new(), vec![]).unwrap();
+        assert_eq!(out, WriteOutcome::no_change(id));
+    }
+
+    #[test]
+    fn update_set_and_clear_aplica_ambos() {
+        let id = Uuid::new_v4();
+        let mut b = MockBackend::with_records([("X".into(), id, json!({"a": 1, "b": 2}))]);
+        let out = b
+            .update("X", id, map_of(&[("a", json!(10))]), vec!["b".into()])
+            .unwrap();
+        assert_eq!(out.changed, 2);
+        let rec = b.load_record("X", id).unwrap();
+        assert_eq!(rec.get("a"), Some(&json!(10)));
+        assert!(rec.get("b").is_none());
+    }
+
+    #[test]
+    fn delete_then_load_returns_none() {
+        let id = Uuid::new_v4();
+        let mut b = MockBackend::with_records([("X".into(), id, json!({"k": 1}))]);
+        b.delete("X", id).unwrap();
+        assert!(b.load_record("X", id).is_none());
+    }
+
+    #[test]
+    fn morphism_without_handler_errors_clearly() {
+        let mut b = MockBackend::new();
+        let err = b
+            .morphism("mod", "foo", BTreeMap::new(), json!({}))
+            .unwrap_err();
+        assert!(err.contains("foo"));
+    }
+
+    #[test]
+    fn with_morphism_lets_caller_simulate_logic() {
+        let mut b = MockBackend::new().with_morphism("double_qty", |inputs, params| {
+            assert!(inputs.is_empty());
+            let qty = params.get("qty").and_then(|v| v.as_i64()).unwrap_or(0);
+            if qty <= 0 {
+                return Err("qty must be positive".into());
+            }
+            Ok(qty as usize)
+        });
+        let out = b
+            .morphism("mod", "double_qty", BTreeMap::new(), json!({"qty": 7}))
+            .unwrap();
+        assert_eq!(out.changed, 7);
+        assert!(out.id.is_none(), "morphism no devuelve id por convención");
+
+        let err = b
+            .morphism("mod", "double_qty", BTreeMap::new(), json!({"qty": 0}))
+            .unwrap_err();
+        assert!(err.contains("positive"));
+    }
+
+    #[test]
+    fn list_records_orders_lexicographically() {
+        let id_a = Uuid::parse_str("00000000-0000-0000-0000-000000000001").unwrap();
+        let id_b = Uuid::parse_str("ffffffff-0000-0000-0000-000000000000").unwrap();
+        let b = MockBackend::with_records([
+            ("X".into(), id_b, json!({"n": 2})),
+            ("X".into(), id_a, json!({"n": 1})),
+        ]);
+        let rows = b.list_records("X");
+        assert_eq!(rows.len(), 2);
+        assert_eq!(rows[0].0, id_a, "menor uuid primero (orden lex)");
+    }
+
+    #[test]
+    fn records_for_returns_borrowed_view() {
+        let id = Uuid::new_v4();
+        let b = MockBackend::with_records([("X".into(), id, json!({"k": 1}))]);
+        let view = b.records_for("X");
+        assert_eq!(view.len(), 1);
+        assert_eq!(view[0].0, id);
+        assert_eq!(view[0].1.get("k"), Some(&json!(1)));
+    }
+}
diff --git a/02_ruway/nahual/libs/meta-schema/Cargo.toml b/02_ruway/nahual/libs/meta-schema/Cargo.toml
new file mode 100644
index 0000000..ba3b12b
--- /dev/null
+++ b/02_ruway/nahual/libs/meta-schema/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "nahual-meta-schema"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+description = "Yahweh — meta-schema: descriptores declarativos de UI (entities, menús, listas, formularios, acciones) consumidos por widgets metainterfaz reusables. Independiente del backend: cualquier app que monte una UI dirigida por datos puede usarlo."
+
+[dependencies]
+serde = { workspace = true }
+serde_json = { workspace = true }
+thiserror = { workspace = true }
+
+[dev-dependencies]
+tempfile = { workspace = true }
diff --git a/02_ruway/nahual/libs/meta-schema/LEEME.md b/02_ruway/nahual/libs/meta-schema/LEEME.md
new file mode 100644
index 0000000..a2b62b7
--- /dev/null
+++ b/02_ruway/nahual/libs/meta-schema/LEEME.md
@@ -0,0 +1,9 @@
+# meta-schema
+
+> Schema declarativo de viewers de [nahual](../../README.md).
+
+Define la estructura JSON que describe un viewer: campos, layout, eventos. Lo que [`meta-runtime`](../meta-runtime/README.md) interpreta para montar la app.
+
+## Deps
+
+- `serde`, `serde_json`
diff --git a/02_ruway/nahual/libs/meta-schema/README.md b/02_ruway/nahual/libs/meta-schema/README.md
new file mode 100644
index 0000000..5de58a8
--- /dev/null
+++ b/02_ruway/nahual/libs/meta-schema/README.md
@@ -0,0 +1,9 @@
+# meta-schema
+
+> Declarative viewer schema for [nahual](../../README.md).
+
+Defines the JSON structure describing a viewer: fields, layout, events. What [`meta-runtime`](../meta-runtime/README.md) interprets to mount the app.
+
+## Deps
+
+- `serde`, `serde_json`
diff --git a/02_ruway/nahual/libs/meta-schema/src/lib.rs b/02_ruway/nahual/libs/meta-schema/src/lib.rs
new file mode 100644
index 0000000..ee80e2b
--- /dev/null
+++ b/02_ruway/nahual/libs/meta-schema/src/lib.rs
@@ -0,0 +1,1194 @@
+//! Schema declarativo de la metainterfaz (nahual meta-schema).
+//!
+//! Cada **módulo** declara aquí qué menús, vistas, listas y
+//! formularios expone, sin escribir código GPUI ni Rust. Cualquier
+//! runtime de UI dirigida por datos (Nakui hoy, otros mañana) lo
+//! carga y monta la UI correspondiente.
+//!
+//! ## Filosofía
+//!
+//! - **UI como datos**: agregar un módulo = escribir un JSON o un
+//!   `.ncl`. Ningún recompile, ningún acoplamiento con el binario
+//!   del runtime.
+//! - **Backend-agnostic**: este crate sólo describe la *forma* de
+//!   la UI. La conexión a un store/log/executor concretos vive en
+//!   el runtime que lo consume (ej: el meta-runtime de Nakui que
+//!   wirea esto a `nakui_core` + KCL post-checks).
+//! - **Schema primero, semántica después**: validación semántica
+//!   (referencias rotas a entities, campos faltantes, etc.) vive
+//!   en el runtime que lo carga, no acá.
+//!
+//! ## Anatomía de un módulo
+//!
+//! ```json
+//! {
+//!   "id": "customers",
+//!   "label": "Clientes",
+//!   "entities": [
+//!     { "name": "customer", "fields": [ ... ] }
+//!   ],
+//!   "menu": [
+//!     { "label": "Listar", "view": "list" },
+//!     { "label": "Nuevo", "view": "form" }
+//!   ],
+//!   "views": {
+//!     "list": { "kind": "list", "entity": "customer", "columns": [...] },
+//!     "form": { "kind": "form", "entity": "customer", "fields": [...] }
+//!   }
+//! }
+//! ```
+
+#![forbid(unsafe_code)]
+#![warn(rust_2018_idioms)]
+
+use std::collections::BTreeMap;
+use std::path::{Path, PathBuf};
+
+use serde::{Deserialize, Serialize};
+use thiserror::Error;
+
+/// Manifiesto de un módulo declarativo de UI.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Module {
+    /// Identificador estable. Único dentro del directorio cargado.
+    pub id: String,
+
+    /// Nombre legible para mostrar en el sidebar.
+    pub label: String,
+
+    /// Descripción corta opcional (tooltip / subtítulo).
+    #[serde(default)]
+    pub description: Option<String>,
+
+    /// Entities que el módulo introduce o consume. El runtime las
+    /// usa para validar columns/fields y para inicializar el store
+    /// cuando son nuevas.
+    #[serde(default)]
+    pub entities: Vec<EntitySpec>,
+
+    /// Path opaco al backend que va a manejar este módulo. Lo
+    /// interpreta el runtime concreto (no este schema).
+    ///
+    /// Convención actual de Nakui: directorio con `nsmc.json` +
+    /// schemas KCL + scripts Rhai. Cuando está set, el runtime
+    /// Nakui carga un `Executor` para ese path y permite que las
+    /// acciones `Morphism { name }` despachen al pipeline real
+    /// (compute → log → apply). Otro backend puede ignorar este
+    /// campo o darle un significado distinto.
+    ///
+    /// Path resuelto relativo al directorio del `module.json`
+    /// o absoluto.
+    ///
+    /// Si es `None`, los backends que requieren manifest deberían
+    /// degradar (toast informativo, deshabilitar morphisms, etc.);
+    /// los `SeedEntity` siguen funcionando — son altas
+    /// administrativas que no necesitan validación de manifest.
+    ///
+    /// Nombre conservado por compat con módulos ya escritos.
+    /// Renombrar a `backend_module_dir` o similar si emerge un
+    /// segundo backend que también lo use.
+    #[serde(default, alias = "backend_module_dir")]
+    pub nakui_module_dir: Option<String>,
+
+    /// Items del menú. Cada uno apunta a una key de `views`. Orden
+    /// importa (es el orden en que se presentan en el sidebar).
+    pub menu: Vec<MenuItem>,
+
+    /// Vistas indexadas por key. Las keys son referenciadas por
+    /// `MenuItem.view` y por `Action::OpenView.view`.
+    pub views: BTreeMap<String, View>,
+}
+
+/// Item del menú lateral.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct MenuItem {
+    pub label: String,
+    /// Key de la vista a abrir. Debe existir en `Module.views`.
+    pub view: String,
+    /// Icono opcional (texto unicode o emoji; el runtime decide
+    /// renderización).
+    #[serde(default)]
+    pub icon: Option<String>,
+}
+
+/// Una vista renderizada en el área principal cuando su menú es seleccionado.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(tag = "kind", rename_all = "snake_case")]
+pub enum View {
+    /// Tabla de instancias de una entity, columnas + acciones por fila.
+    List(ListView),
+    /// Formulario de creación / edición.
+    Form(FormView),
+    /// Ficha de un record: sus campos + listas de records relacionados.
+    Detail(DetailView),
+    /// Tablero de KPIs: una grilla de tarjetas de agregados.
+    Dashboard(DashboardView),
+    /// Reporte imprimible: los mismos agregados que un tablero, pero
+    /// dispuestos como documento de una columna (título + fecha de
+    /// generación) y exportable a Markdown.
+    Report(ReportView),
+    /// Grafo de dependencias: el DAG de morfismos del módulo nakui. Cada
+    /// morfismo es un nodo; los tokens que lee/escribe son sus pins; las
+    /// aristas de flujo de datos (escritura→lectura del mismo token) son
+    /// los cables. Visualiza la cascada reactiva que conecta el dato.
+    Graph(GraphView),
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ListView {
+    pub title: String,
+    /// Entity (del nakui store) cuyas instancias se listan.
+    pub entity: String,
+    /// Columnas a mostrar. Orden importa.
+    pub columns: Vec<Column>,
+    /// Acciones disponibles a nivel de la lista (ej. "Nuevo" → form).
+    /// Renderizadas como botones en el header.
+    #[serde(default)]
+    pub actions: Vec<Action>,
+    /// Cuando está set, se muestra una caja de búsqueda que filtra
+    /// las filas por substring contra los valores de estas columnas.
+    #[serde(default)]
+    pub search_in: Vec<String>,
+    /// Si está set, cada fila gana un botón 👁 que abre esta vista
+    /// (debe ser una `View::Detail`) para el record de la fila.
+    #[serde(default)]
+    pub row_detail: Option<String>,
+}
+
+/// Ficha de un record: sus campos + listas de records relacionados.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DetailView {
+    pub title: String,
+    /// Entity del record que se muestra.
+    pub entity: String,
+    /// Campos a mostrar, en orden. Reusa [`Column`] (label + field +
+    /// `ref_entity` + `format`; el `weight` se ignora en la ficha).
+    #[serde(default)]
+    pub fields: Vec<Column>,
+    /// Listas de records relacionados (back-references).
+    #[serde(default)]
+    pub related: Vec<RelatedList>,
+    /// KPIs scopeados al record (el "360" de la ficha): agregados sobre
+    /// los records relacionados (`entity` cuyo `via_field` apunta al
+    /// record actual), p.ej. en la ficha de un cliente "Total facturado"
+    /// / "Órdenes" / "Ticket promedio". Renderizados como stat cards
+    /// arriba de las listas relacionadas.
+    #[serde(default)]
+    pub metrics: Vec<DetailMetric>,
+}
+
+/// Un KPI scopeado a un record dentro de una [`DetailView`]: computa
+/// `metric` sobre los records de `entity` cuyo `via_field` referencia
+/// al record que se está viendo (mismo criterio de scope que una
+/// [`RelatedList`]), con un `filter` opcional adicional.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DetailMetric {
+    pub label: String,
+    /// Entity sobre cuyos records relacionados se computa el agregado.
+    pub entity: String,
+    /// Campo de esa entity que referencia (UUID) al record actual.
+    pub via_field: String,
+    pub metric: Metric,
+    /// Filtro adicional opcional (AND con el scope), p.ej. `pagado=true`
+    /// para un KPI "cobrado".
+    #[serde(default)]
+    pub filter: Option<CardFilter>,
+    /// Formato del número resultante (`Currency` para sumas de dinero).
+    #[serde(default)]
+    pub format: ValueFormat,
+}
+
+/// Una lista de records relacionados dentro de una [`DetailView`]: los
+/// records de otra entity cuyo campo `via_field` apunta al record que
+/// se está viendo.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct RelatedList {
+    pub title: String,
+    /// Entity de los records relacionados.
+    pub entity: String,
+    /// Campo de esa entity cuyo valor (UUID) referencia al record
+    /// actual. El runtime filtra `record[via_field] == id_actual`.
+    pub via_field: String,
+    pub columns: Vec<Column>,
+}
+
+/// Tablero de KPIs: una grilla de tarjetas de agregados.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DashboardView {
+    pub title: String,
+    pub cards: Vec<DashboardCard>,
+}
+
+/// Reporte imprimible: mismos agregados que un tablero, presentados
+/// como documento exportable. Opcionalmente un subtítulo/encabezado.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ReportView {
+    pub title: String,
+    /// Línea de subtítulo opcional bajo el título (período, área…).
+    #[serde(default)]
+    pub subtitle: Option<String>,
+    pub cards: Vec<DashboardCard>,
+    /// Controles interactivos: cada uno es un filtro etiquetado que el
+    /// usuario prende/apaga desde la UI. Cuando está activo, su filtro
+    /// se aplica (AND) sobre los records de cada card antes de agregar
+    /// —recortando el reporte sin tocar el `module.json`—.
+    #[serde(default)]
+    pub toggles: Vec<ReportToggle>,
+}
+
+/// Un control de filtro interactivo de un [`ReportView`].
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ReportToggle {
+    /// Texto del botón (p.ej. "Solo pagadas", "Q1 2026").
+    pub label: String,
+    /// Si está set, el toggle sólo afecta a las cards de esta entity
+    /// (evita vaciar cards de otra entity que no tiene el campo). Si es
+    /// `None`, se aplica a todas las cards.
+    #[serde(default)]
+    pub entity: Option<String>,
+    /// Filtro que se aplica cuando el control está activo.
+    pub filter: CardFilter,
+}
+
+/// Vista grafo: el DAG de morfismos del módulo nakui. No tiene
+/// parámetros más allá del título y un subtítulo opcional — el grafo se
+/// deriva en runtime del manifest del `Executor` del módulo (los
+/// morfismos y los tokens que lee/escribe cada uno), no se declara acá.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct GraphView {
+    pub title: String,
+    /// Línea de contexto opcional bajo el título.
+    #[serde(default)]
+    pub subtitle: Option<String>,
+}
+
+/// Una tarjeta de KPI del tablero.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DashboardCard {
+    /// Etiqueta de la tarjeta.
+    pub label: String,
+    /// Entity sobre cuyos records se computa el agregado.
+    pub entity: String,
+    /// Qué se computa.
+    pub metric: Metric,
+    /// Filtro opcional: sólo entran los records que lo cumplen.
+    #[serde(default)]
+    pub filter: Option<CardFilter>,
+    /// Formato del número resultante (`Currency` para sumas de dinero).
+    /// Ignorado por `GroupBy`.
+    #[serde(default)]
+    pub format: ValueFormat,
+    /// Cuando el agregado produce un desglose por grupo (`GroupBy` /
+    /// `SumBy` / `AvgBy`) y la clave de grupo es un UUID que referencia
+    /// a otra entity, esta entity se usa para resolver cada clave a su
+    /// label legible (p.ej. "facturación por cliente" muestra nombres
+    /// en vez de UUIDs). El runtime de presentación hace la resolución;
+    /// el motor de métricas permanece agnóstico.
+    #[serde(default)]
+    pub group_ref: Option<String>,
+    /// Cómo se dibuja un desglose (`GroupBy` / `SumBy` / `AvgBy`):
+    /// barras ASCII (default), torta o dona. Ignorado por métricas
+    /// escalares (`Count` / `Sum` / `Avg` / `Min` / `Max`), que siempre
+    /// se muestran como número grande.
+    #[serde(default)]
+    pub chart: ChartKind,
+    /// Tope de filas de un desglose: se conservan las `limit` de mayor
+    /// valor (el motor ya las ordena de mayor a menor) y el resto se
+    /// colapsa en una fila "Otros" (suma para conteos/`SumBy`, promedio
+    /// de los grupos restantes para `AvgBy`). Mantiene legibles los
+    /// gráficos sobre dimensiones de muchos grupos. `None` = sin tope.
+    /// Ignorado cuando hay `bucket` (las series temporales no se recortan).
+    #[serde(default)]
+    pub limit: Option<usize>,
+    /// Cuando el campo de grupo de un desglose es una fecha ISO-8601,
+    /// trunca la clave a año/mes/día antes de agregar — convierte el
+    /// desglose en una **serie temporal** (p.ej. "facturación por mes").
+    /// El resultado se ordena cronológicamente (no por valor) y no se
+    /// recorta. `None` = agrupar por el valor crudo del campo.
+    #[serde(default)]
+    pub bucket: Option<DateBucket>,
+    /// Convierte un desglose ordenado en su **acumulado** (running
+    /// total): tras ordenar/recortar, cada valor pasa a ser la suma
+    /// corrida de sí mismo y los anteriores. El caso natural de
+    /// tesorería ("saldo acumulado por mes"); se combina con `bucket`
+    /// para series cronológicas, y en multi-serie cada serie acumula por
+    /// separado. Sólo tiene sentido sobre métricas aditivas
+    /// (`Count`/`Sum`/`SumBy`/`SumBySeries`). `false` = valores por
+    /// período (default).
+    #[serde(default)]
+    pub cumulative: bool,
+}
+
+/// Granularidad de truncado de una fecha ISO-8601 para series temporales.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum DateBucket {
+    /// Año: `2026-01-15` → `2026`.
+    Year,
+    /// Año-mes: `2026-01-15` → `2026-01`.
+    Month,
+    /// Día (fecha completa): `2026-01-15` → `2026-01-15`.
+    Day,
+}
+
+/// Forma visual de un desglose de tablero/reporte.
+#[derive(Debug, Clone, Copy, Default, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum ChartKind {
+    /// Barras horizontales en caracteres de bloque. Default.
+    #[default]
+    Bars,
+    /// Gráfico de torta: cada grupo es un sector proporcional a su valor.
+    Pie,
+    /// Como `Pie` pero con el centro hueco (anillo).
+    Donut,
+    /// Columnas verticales, una por grupo (en el orden del desglose).
+    /// Apto para series ordenadas (p.ej. ingresos por mes). En un
+    /// desglose multi-serie (`SumBySeries`) las series se dibujan
+    /// **agrupadas** (lado a lado dentro de cada grupo).
+    Columns,
+    /// Línea que une los valores de cada grupo, con un punto por grupo.
+    /// Pensado para tendencias sobre un eje ordenado.
+    Line,
+    /// Columnas verticales **apiladas**: sólo aplica a desgloses
+    /// multi-serie (`SumBySeries`); cada grupo es una sola columna donde
+    /// los segmentos de cada serie se apilan, y la altura total es la
+    /// suma del grupo (composición sobre un eje ordenado). En un
+    /// desglose de una sola dimensión se comporta como `Columns`.
+    StackedColumns,
+}
+
+/// El agregado que computa una [`DashboardCard`].
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(tag = "kind", rename_all = "snake_case")]
+pub enum Metric {
+    /// Cantidad de records.
+    Count,
+    /// Suma de un campo numérico.
+    Sum { field: String },
+    /// Promedio de un campo numérico (ignora records sin el campo).
+    Avg { field: String },
+    /// Mínimo de un campo numérico.
+    Min { field: String },
+    /// Máximo de un campo numérico.
+    Max { field: String },
+    /// Cantidad de **valores distintos** de un campo (ignora records sin
+    /// el campo o vacíos) — p.ej. "clientes distintos con órdenes",
+    /// "cajas con movimiento", "días con actividad".
+    CountDistinct { field: String },
+    /// Conteo de records por cada valor distinto de un campo.
+    GroupBy { field: String },
+    /// Suma de `value` por cada valor distinto de `group` — el reporte
+    /// ERP clásico ("facturación por cliente", "ingresos por mes").
+    SumBy { group: String, value: String },
+    /// Promedio de `value` por cada valor distinto de `group`
+    /// ("ticket promedio por plan").
+    AvgBy { group: String, value: String },
+    /// Suma de `value` por cada combinación de `group` × `series` — un
+    /// desglose de **dos dimensiones** ("facturación por mes, por
+    /// plan"). El eje principal es `group` (x); cada valor distinto de
+    /// `series` es una serie sobre ese eje. Se renderiza como
+    /// multi-línea o columnas agrupadas.
+    SumBySeries {
+        group: String,
+        series: String,
+        value: String,
+    },
+}
+
+/// Operador de comparación de un [`CardFilter`].
+#[derive(Debug, Clone, Copy, Default, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum FilterOp {
+    /// Igualdad textual contra `value`. Default (compat con `equals`).
+    #[default]
+    Eq,
+    /// Desigualdad textual.
+    Ne,
+    /// Mayor que `value` (numérico, o fecha ISO comparada como texto).
+    Gt,
+    /// Mayor o igual.
+    Gte,
+    /// Menor que.
+    Lt,
+    /// Menor o igual.
+    Lte,
+    /// Dentro de `[min, max]` inclusivo (cualquiera de las dos cotas
+    /// puede omitirse para un rango abierto).
+    Between,
+    /// El campo existe y no está vacío.
+    NonEmpty,
+}
+
+/// Filtro de una [`DashboardCard`]: decide qué records entran al
+/// agregado. El default (`op: eq` + `value`) replica el viejo
+/// `{ field, equals }`, que sigue parseando por el alias `equals`.
+/// Para `gt`/`lt`/`between`, las comparaciones son numéricas si ambos
+/// lados parsean como número, y lexicográficas en caso contrario —
+/// suficiente para rangos de fecha en ISO-8601 (`YYYY-MM-DD`).
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct CardFilter {
+    pub field: String,
+    /// Operador. Default `eq`.
+    #[serde(default)]
+    pub op: FilterOp,
+    /// Comparando para `eq`/`ne`/`gt`/`gte`/`lt`/`lte`. Acepta el alias
+    /// `equals` por compatibilidad con tableros ya escritos.
+    #[serde(default, alias = "equals")]
+    pub value: Option<String>,
+    /// Cota inferior para `between` (inclusiva). `None` = sin piso.
+    #[serde(default)]
+    pub min: Option<String>,
+    /// Cota superior para `between` (inclusiva). `None` = sin techo.
+    #[serde(default)]
+    pub max: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Column {
+    /// Path del campo dentro del record. Para tipos planos: nombre.
+    /// Para nested: puntos (`address.city`). El runtime navega.
+    pub field: String,
+    /// Texto del header.
+    pub label: String,
+    /// Ancho relativo (peso flex). Default 1.
+    #[serde(default = "default_weight")]
+    pub weight: f32,
+    /// Si está set, la celda resuelve su valor (un UUID) al label
+    /// legible del record de esta entity, en vez de mostrar el UUID
+    /// crudo. Para columnas que son referencias a otra entity.
+    #[serde(default)]
+    pub ref_entity: Option<String>,
+    /// Formato de presentación del valor de la celda.
+    #[serde(default)]
+    pub format: ValueFormat,
+}
+
+fn default_weight() -> f32 {
+    1.0
+}
+
+/// Formato de presentación de un valor en una celda de lista.
+#[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(tag = "kind", rename_all = "snake_case")]
+pub enum ValueFormat {
+    /// Sin format — el valor se muestra crudo. Default.
+    #[default]
+    Plain,
+    /// Entero/decimal con separador de miles (`12000` → `12,000`).
+    Number,
+    /// Moneda: separador de miles + símbolo prefijo (`12000` → `$12,000`).
+    Currency { symbol: String },
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct FormView {
+    pub title: String,
+    /// Entity destino del seed/morphism al submit.
+    pub entity: String,
+    pub fields: Vec<FieldSpec>,
+    /// Acción al submit. Típicamente `Action::SeedEntity` para alta
+    /// directa o `Action::Morphism` cuando hay validación/cálculo.
+    pub on_submit: Action,
+}
+
+/// Especificación de un campo de formulario o columna implícita.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct FieldSpec {
+    /// Nombre del campo en el record (clave del JSON).
+    pub name: String,
+    /// Etiqueta legible.
+    pub label: String,
+    /// Tipo del valor — define el widget de input + parseo.
+    pub kind: FieldKind,
+    /// Valor por defecto al abrir el form (string raw; el parseo
+    /// según `kind` lo hace el runtime).
+    #[serde(default)]
+    pub default: Option<String>,
+    /// Si `true`, el form rechaza submit con campo vacío.
+    #[serde(default)]
+    pub required: bool,
+    /// Texto de ayuda mostrado bajo el input.
+    #[serde(default)]
+    pub help: Option<String>,
+    /// Si `kind == EntityRef`, indica qué entity referencia. Sin
+    /// esto, el runtime no sabe qué records ofrecer en el selector
+    /// y la validación `Module::validate` rechaza el manifest.
+    /// Para los demás kinds, este campo se ignora.
+    #[serde(default)]
+    pub ref_entity: Option<String>,
+    /// Opciones de un campo `kind == Select`. Ignorado para los demás
+    /// kinds. `Module::validate` exige que un Select las tenga.
+    #[serde(default)]
+    pub options: Vec<SelectOption>,
+    /// Sección del formulario a la que pertenece el campo. Campos
+    /// consecutivos con la misma sección se agrupan bajo un encabezado.
+    #[serde(default)]
+    pub section: Option<String>,
+}
+
+#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq)]
+#[serde(rename_all = "snake_case")]
+pub enum FieldKind {
+    /// Texto libre.
+    Text,
+    /// Texto multilínea.
+    Multiline,
+    /// Número (i64 o f64; runtime intenta parsear como i64 primero).
+    Number,
+    /// Booleano (renderizado como checkbox).
+    Boolean,
+    /// Fecha (format ISO YYYY-MM-DD; almacenada como string).
+    Date,
+    /// Referencia a otro record. El runtime renderiza un selector
+    /// clickable de records existentes de la entity declarada en
+    /// `FieldSpec.ref_entity`; el value almacenado es el UUID del
+    /// seleccionado, parseable como cualquier text/UUID al submit.
+    EntityRef,
+    /// Valor elegido de un conjunto cerrado declarado en
+    /// `FieldSpec.options`. El runtime lo renderiza como selección
+    /// (no texto libre). `Module::validate` exige `options` no vacío.
+    Select,
+    /// Identificador autogenerado (UUID v4). El runtime lo rellena al
+    /// abrir el formulario; el usuario no lo teclea ni lo edita. Para
+    /// los ids de idempotencia que piden los morfismos.
+    AutoId,
+}
+
+/// Una opción de un campo [`FieldKind::Select`].
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SelectOption {
+    /// Valor que se guarda (lo que recibe el backend o el morfismo).
+    pub value: String,
+    /// Etiqueta legible. Si se omite, se muestra el `value` crudo.
+    #[serde(default)]
+    pub label: Option<String>,
+}
+
+impl SelectOption {
+    /// Texto a mostrar: `label` si está, sino el `value`.
+    pub fn display(&self) -> &str {
+        self.label.as_deref().unwrap_or(&self.value)
+    }
+}
+
+/// Acciones disparables por menús, botones o submit de formularios.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(tag = "kind", rename_all = "snake_case")]
+pub enum Action {
+    /// Cambia la vista activa a otra del mismo módulo.
+    OpenView {
+        view: String,
+        /// Etiqueta del botón / item; default = nombre humano de la vista.
+        #[serde(default)]
+        label: Option<String>,
+    },
+    /// Crea un seed directo en la entity con los valores del form.
+    /// Equivalente a `nakui_core::event_log::seed_and_log`.
+    /// Sin pipeline de morphism — alta administrativa.
+    SeedEntity {
+        entity: String,
+        /// Tras el submit exitoso, opcionalmente abrir esta vista
+        /// (por convención: `"list"` para volver al listado).
+        #[serde(default)]
+        next_view: Option<String>,
+    },
+    /// Ejecuta un morphism declarado en el manifest del módulo
+    /// nakui-core (cuyo path vive en `Module.nakui_module_dir`).
+    /// Inputs (records existentes) y params (valores escalares) se
+    /// mapean desde los campos del form.
+    Morphism {
+        /// Nombre del morphism declarado en `nsmc.json` del manifest
+        /// nakui apuntado por el módulo.
+        name: String,
+        /// Mapeo `role → field_name`: por cada input declarado en
+        /// el `MorphismSpec.inputs`, indica qué field del form
+        /// contiene el UUID del record. El runtime parsea el value
+        /// como `Uuid` y lo pasa como input al `execute_and_log`.
+        ///
+        /// Ej: `{ "stock": "stock_id", "caja": "caja_id" }` para un
+        /// morphism `vender` que toma roles `stock` y `caja`.
+        #[serde(default)]
+        inputs: BTreeMap<String, String>,
+        /// Lista de fields del form cuyos values van al `params`
+        /// JSON object pasado al morphism. Si está vacío, todos los
+        /// fields que no estén en `inputs` van a params.
+        #[serde(default)]
+        params: Vec<String>,
+        #[serde(default)]
+        next_view: Option<String>,
+    },
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct EntitySpec {
+    /// Nombre de la entity (clave en el store). Único dentro del módulo.
+    pub name: String,
+    /// Label legible (singular).
+    pub label: String,
+    /// Campos esperados en records de esta entity. Usados por el
+    /// runtime para inferir columnas / validar formularios.
+    #[serde(default)]
+    pub fields: Vec<FieldSpec>,
+}
+
+#[derive(Debug, Error)]
+pub enum SchemaError {
+    #[error("io leyendo {path}: {source}")]
+    Io {
+        path: PathBuf,
+        #[source]
+        source: std::io::Error,
+    },
+    #[error("parseo de {path}: {source}")]
+    Parse {
+        path: PathBuf,
+        #[source]
+        source: serde_json::Error,
+    },
+    #[error("módulo {id}: la vista '{view}' referenciada por menu_item '{item}' no existe")]
+    DanglingMenuView {
+        id: String,
+        item: String,
+        view: String,
+    },
+    #[error("módulos con id duplicado: '{id}' aparece en {first} y {second}")]
+    DuplicateModuleId {
+        id: String,
+        first: PathBuf,
+        second: PathBuf,
+    },
+    #[error(
+        "módulo {id} vista '{view}': field '{field}' tiene kind=entity_ref \
+         pero no declaró ref_entity"
+    )]
+    EntityRefMissingTarget {
+        id: String,
+        view: String,
+        field: String,
+    },
+    #[error(
+        "módulo {id} vista '{view}': field '{field}' tiene kind=select \
+         pero no declaró options"
+    )]
+    SelectMissingOptions {
+        id: String,
+        view: String,
+        field: String,
+    },
+    #[error(
+        "módulo {id} vista '{view}': row_detail='{target}' no apunta a \
+         una vista kind=detail"
+    )]
+    RowDetailInvalid {
+        id: String,
+        view: String,
+        target: String,
+    },
+}
+
+impl Module {
+    /// Carga un module.json desde disco. Validación estructural
+    /// posterior (vistas referenciadas existen, etc.) la ejecuta el
+    /// runtime — acá sólo parseamos.
+    pub fn from_path(path: impl AsRef<Path>) -> Result<Self, SchemaError> {
+        let path = path.as_ref();
+        let bytes = std::fs::read(path).map_err(|source| SchemaError::Io {
+            path: path.to_path_buf(),
+            source,
+        })?;
+        serde_json::from_slice(&bytes).map_err(|source| SchemaError::Parse {
+            path: path.to_path_buf(),
+            source,
+        })
+    }
+
+    /// Validación post-parse:
+    /// - Cada `MenuItem.view` debe existir en `views`.
+    /// - Cada `FieldSpec` con `kind=EntityRef` debe declarar
+    ///   `ref_entity`.
+    pub fn validate(&self) -> Result<(), SchemaError> {
+        for item in &self.menu {
+            if !self.views.contains_key(&item.view) {
+                return Err(SchemaError::DanglingMenuView {
+                    id: self.id.clone(),
+                    item: item.label.clone(),
+                    view: item.view.clone(),
+                });
+            }
+        }
+        for (view_key, view) in &self.views {
+            match view {
+                View::Form(form) => {
+                    for f in &form.fields {
+                        if f.kind == FieldKind::EntityRef && f.ref_entity.is_none() {
+                            return Err(SchemaError::EntityRefMissingTarget {
+                                id: self.id.clone(),
+                                view: view_key.clone(),
+                                field: f.name.clone(),
+                            });
+                        }
+                        if f.kind == FieldKind::Select && f.options.is_empty() {
+                            return Err(SchemaError::SelectMissingOptions {
+                                id: self.id.clone(),
+                                view: view_key.clone(),
+                                field: f.name.clone(),
+                            });
+                        }
+                    }
+                }
+                View::List(list) => {
+                    if let Some(target) = &list.row_detail {
+                        if !matches!(self.views.get(target), Some(View::Detail(_))) {
+                            return Err(SchemaError::RowDetailInvalid {
+                                id: self.id.clone(),
+                                view: view_key.clone(),
+                                target: target.clone(),
+                            });
+                        }
+                    }
+                }
+                View::Detail(_) | View::Dashboard(_) | View::Report(_) | View::Graph(_) => {}
+            }
+        }
+        Ok(())
+    }
+}
+
+/// Carga todos los `module.json` encontrados bajo `dir` (recursivo
+/// 1 nivel — espera `dir/<modulo>/module.json`). Devuelve la lista
+/// ordenada por id, validada.
+///
+/// Falla si: I/O, parseo, módulo inválido, o ids duplicados.
+pub fn load_modules_from_dir(dir: impl AsRef<Path>) -> Result<Vec<Module>, SchemaError> {
+    let dir = dir.as_ref();
+    let mut modules: Vec<(PathBuf, Module)> = Vec::new();
+    let entries = std::fs::read_dir(dir).map_err(|source| SchemaError::Io {
+        path: dir.to_path_buf(),
+        source,
+    })?;
+    for entry in entries.flatten() {
+        let p = entry.path();
+        if p.is_dir() {
+            let manifest = p.join("module.json");
+            if manifest.exists() {
+                let m = Module::from_path(&manifest)?;
+                m.validate()?;
+                modules.push((manifest, m));
+            }
+        }
+    }
+    // Detectar duplicados de id.
+    modules.sort_by(|a, b| a.1.id.cmp(&b.1.id));
+    let mut prev: Option<&(PathBuf, Module)> = None;
+    for cur in &modules {
+        if let Some(p) = prev {
+            if p.1.id == cur.1.id {
+                return Err(SchemaError::DuplicateModuleId {
+                    id: cur.1.id.clone(),
+                    first: p.0.clone(),
+                    second: cur.0.clone(),
+                });
+            }
+        }
+        prev = Some(cur);
+    }
+    Ok(modules.into_iter().map(|(_, m)| m).collect())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn sample_module() -> Module {
+        Module {
+            id: "customers".into(),
+            label: "Clientes".into(),
+            description: Some("Gestión de clientes".into()),
+            nakui_module_dir: None,
+            entities: vec![EntitySpec {
+                name: "customer".into(),
+                label: "Cliente".into(),
+                fields: vec![
+                    FieldSpec {
+                        name: "name".into(),
+                        label: "Nombre".into(),
+                        kind: FieldKind::Text,
+                        default: None,
+                        required: true,
+                        help: None,
+                        ref_entity: None,
+                        options: Vec::new(),
+                        section: None,
+                    },
+                    FieldSpec {
+                        name: "email".into(),
+                        label: "Email".into(),
+                        kind: FieldKind::Text,
+                        default: None,
+                        required: false,
+                        help: Some("Opcional".into()),
+                        ref_entity: None,
+                        options: Vec::new(),
+                        section: None,
+                    },
+                ],
+            }],
+            menu: vec![
+                MenuItem {
+                    label: "Listar".into(),
+                    view: "list".into(),
+                    icon: None,
+                },
+                MenuItem {
+                    label: "Nuevo".into(),
+                    view: "form".into(),
+                    icon: None,
+                },
+            ],
+            views: BTreeMap::from([
+                (
+                    "list".into(),
+                    View::List(ListView {
+                        title: "Clientes".into(),
+                        entity: "customer".into(),
+                        columns: vec![
+                            Column {
+                                field: "name".into(),
+                                label: "Nombre".into(),
+                                weight: 2.0,
+                                ref_entity: None,
+                                format: ValueFormat::Plain,
+                            },
+                            Column {
+                                field: "email".into(),
+                                label: "Email".into(),
+                                weight: 3.0,
+                                ref_entity: None,
+                                format: ValueFormat::Plain,
+                            },
+                        ],
+                        actions: vec![Action::OpenView {
+                            view: "form".into(),
+                            label: Some("Nuevo".into()),
+                        }],
+                        search_in: vec!["name".into(), "email".into()],
+                        row_detail: None,
+                    }),
+                ),
+                (
+                    "form".into(),
+                    View::Form(FormView {
+                        title: "Nuevo cliente".into(),
+                        entity: "customer".into(),
+                        fields: vec![FieldSpec {
+                            name: "name".into(),
+                            label: "Nombre".into(),
+                            kind: FieldKind::Text,
+                            default: None,
+                            required: true,
+                            help: None,
+                            ref_entity: None,
+                            options: Vec::new(),
+                            section: None,
+                        }],
+                        on_submit: Action::SeedEntity {
+                            entity: "customer".into(),
+                            next_view: Some("list".into()),
+                        },
+                    }),
+                ),
+            ]),
+        }
+    }
+
+    #[test]
+    fn module_serialize_deserialize_roundtrip() {
+        let m = sample_module();
+        let s = serde_json::to_string_pretty(&m).unwrap();
+        let m2: Module = serde_json::from_str(&s).unwrap();
+        assert_eq!(m.id, m2.id);
+        assert_eq!(m.menu.len(), m2.menu.len());
+        assert_eq!(m.views.len(), m2.views.len());
+    }
+
+    #[test]
+    fn validate_passes_for_well_formed_module() {
+        sample_module().validate().unwrap();
+    }
+
+    #[test]
+    fn validate_catches_dangling_menu_view() {
+        let mut m = sample_module();
+        m.menu.push(MenuItem {
+            label: "Roto".into(),
+            view: "no_existe".into(),
+            icon: None,
+        });
+        let err = m.validate().unwrap_err();
+        assert!(matches!(err, SchemaError::DanglingMenuView { .. }));
+    }
+
+    #[test]
+    fn from_path_loads_real_file() {
+        let tmp = tempfile::tempdir().unwrap();
+        let path = tmp.path().join("module.json");
+        std::fs::write(&path, serde_json::to_vec_pretty(&sample_module()).unwrap()).unwrap();
+        let m = Module::from_path(&path).unwrap();
+        assert_eq!(m.id, "customers");
+    }
+
+    #[test]
+    fn load_modules_from_dir_finds_subdirs() {
+        let tmp = tempfile::tempdir().unwrap();
+        let cust_dir = tmp.path().join("customers");
+        std::fs::create_dir(&cust_dir).unwrap();
+        let mut m1 = sample_module();
+        m1.id = "customers".into();
+        std::fs::write(
+            cust_dir.join("module.json"),
+            serde_json::to_vec_pretty(&m1).unwrap(),
+        )
+        .unwrap();
+        let prod_dir = tmp.path().join("products");
+        std::fs::create_dir(&prod_dir).unwrap();
+        let mut m2 = sample_module();
+        m2.id = "products".into();
+        std::fs::write(
+            prod_dir.join("module.json"),
+            serde_json::to_vec_pretty(&m2).unwrap(),
+        )
+        .unwrap();
+
+        let mods = load_modules_from_dir(tmp.path()).unwrap();
+        assert_eq!(mods.len(), 2);
+        assert_eq!(mods[0].id, "customers");
+        assert_eq!(mods[1].id, "products");
+    }
+
+    #[test]
+    fn validate_catches_entity_ref_without_target() {
+        let mut m = sample_module();
+        // Inyectamos un form con un campo EntityRef sin ref_entity.
+        m.views.insert(
+            "broken_form".into(),
+            View::Form(FormView {
+                title: "Roto".into(),
+                entity: "customer".into(),
+                fields: vec![FieldSpec {
+                    name: "ref_to_nowhere".into(),
+                    label: "Referencia".into(),
+                    kind: FieldKind::EntityRef,
+                    default: None,
+                    required: true,
+                    help: None,
+                    ref_entity: None,
+                    options: Vec::new(),
+                    section: None,
+                }],
+                on_submit: Action::SeedEntity {
+                    entity: "customer".into(),
+                    next_view: None,
+                },
+            }),
+        );
+        let err = m.validate().unwrap_err();
+        assert!(
+            matches!(err, SchemaError::EntityRefMissingTarget { .. }),
+            "got: {err:?}"
+        );
+    }
+
+    #[test]
+    fn entity_ref_with_target_validates_clean() {
+        let mut m = sample_module();
+        m.views.insert(
+            "ok_form".into(),
+            View::Form(FormView {
+                title: "OK".into(),
+                entity: "customer".into(),
+                fields: vec![FieldSpec {
+                    name: "supplier".into(),
+                    label: "Proveedor".into(),
+                    kind: FieldKind::EntityRef,
+                    default: None,
+                    required: true,
+                    help: None,
+                    ref_entity: Some("supplier".into()),
+                    options: Vec::new(),
+                    section: None,
+                }],
+                on_submit: Action::SeedEntity {
+                    entity: "customer".into(),
+                    next_view: None,
+                },
+            }),
+        );
+        m.menu.push(MenuItem {
+            label: "OK".into(),
+            view: "ok_form".into(),
+            icon: None,
+        });
+        m.validate().unwrap();
+    }
+
+    #[test]
+    fn select_without_options_is_rejected() {
+        let mut m = sample_module();
+        m.views.insert(
+            "sel_form".into(),
+            View::Form(FormView {
+                title: "Select roto".into(),
+                entity: "customer".into(),
+                fields: vec![FieldSpec {
+                    name: "estado".into(),
+                    label: "Estado".into(),
+                    kind: FieldKind::Select,
+                    default: None,
+                    required: true,
+                    help: None,
+                    ref_entity: None,
+                    options: Vec::new(),
+                    section: None,
+                }],
+                on_submit: Action::SeedEntity {
+                    entity: "customer".into(),
+                    next_view: None,
+                },
+            }),
+        );
+        let err = m.validate().unwrap_err();
+        assert!(
+            matches!(err, SchemaError::SelectMissingOptions { .. }),
+            "got: {err:?}"
+        );
+    }
+
+    #[test]
+    fn select_with_options_validates_clean() {
+        let mut m = sample_module();
+        m.views.insert(
+            "sel_form".into(),
+            View::Form(FormView {
+                title: "Select OK".into(),
+                entity: "customer".into(),
+                fields: vec![FieldSpec {
+                    name: "estado".into(),
+                    label: "Estado".into(),
+                    kind: FieldKind::Select,
+                    default: None,
+                    required: true,
+                    help: None,
+                    ref_entity: None,
+                    options: vec![
+                        SelectOption {
+                            value: "activo".into(),
+                            label: Some("Activo".into()),
+                        },
+                        SelectOption {
+                            value: "baja".into(),
+                            label: None,
+                        },
+                    ],
+                    section: None,
+                }],
+                on_submit: Action::SeedEntity {
+                    entity: "customer".into(),
+                    next_view: None,
+                },
+            }),
+        );
+        m.menu.push(MenuItem {
+            label: "Sel".into(),
+            view: "sel_form".into(),
+            icon: None,
+        });
+        m.validate().unwrap();
+    }
+
+    #[test]
+    fn select_option_display_falls_back_to_value() {
+        let with_label = SelectOption {
+            value: "x".into(),
+            label: Some("Equis".into()),
+        };
+        let bare = SelectOption {
+            value: "y".into(),
+            label: None,
+        };
+        assert_eq!(with_label.display(), "Equis");
+        assert_eq!(bare.display(), "y");
+    }
+
+    #[test]
+    fn chart_kind_defaults_to_bars_and_parses() {
+        // Card sin `chart` → default Bars (back-compat con tableros viejos).
+        let card: DashboardCard = serde_json::from_value(serde_json::json!({
+            "label": "Clientes por plan",
+            "entity": "customers",
+            "metric": { "kind": "group_by", "field": "tier" }
+        }))
+        .unwrap();
+        assert_eq!(card.chart, ChartKind::Bars);
+        assert_eq!(card.limit, None);
+
+        // `limit` parsea como entero opcional.
+        let capped: DashboardCard = serde_json::from_value(serde_json::json!({
+            "label": "Top clientes",
+            "entity": "orders",
+            "metric": { "kind": "sum_by", "group": "customer", "value": "monto" },
+            "limit": 8
+        }))
+        .unwrap();
+        assert_eq!(capped.limit, Some(8));
+        assert_eq!(card.bucket, None);
+
+        // `bucket` parsea en snake_case a DateBucket.
+        let serie: DashboardCard = serde_json::from_value(serde_json::json!({
+            "label": "Por mes",
+            "entity": "orders",
+            "metric": { "kind": "sum_by", "group": "fecha", "value": "monto" },
+            "chart": "line",
+            "bucket": "month"
+        }))
+        .unwrap();
+        assert_eq!(serie.bucket, Some(DateBucket::Month));
+
+        // Con `chart` explícito en snake_case.
+        let pie: DashboardCard = serde_json::from_value(serde_json::json!({
+            "label": "Facturación",
+            "entity": "orders",
+            "metric": { "kind": "sum_by", "group": "customer", "value": "monto" },
+            "chart": "pie"
+        }))
+        .unwrap();
+        assert_eq!(pie.chart, ChartKind::Pie);
+        assert_eq!(ChartKind::default(), ChartKind::Bars);
+
+        // Columns y Line también parsean en snake_case.
+        for (raw, want) in [("columns", ChartKind::Columns), ("line", ChartKind::Line)] {
+            let c: DashboardCard = serde_json::from_value(serde_json::json!({
+                "label": "x",
+                "entity": "orders",
+                "metric": { "kind": "sum_by", "group": "mes", "value": "monto" },
+                "chart": raw
+            }))
+            .unwrap();
+            assert_eq!(c.chart, want);
+        }
+    }
+
+    #[test]
+    fn load_modules_detects_duplicate_id() {
+        let tmp = tempfile::tempdir().unwrap();
+        let a_dir = tmp.path().join("a");
+        let b_dir = tmp.path().join("b");
+        std::fs::create_dir_all(&a_dir).unwrap();
+        std::fs::create_dir_all(&b_dir).unwrap();
+        let m = sample_module(); // id = "customers"
+        std::fs::write(a_dir.join("module.json"), serde_json::to_vec(&m).unwrap()).unwrap();
+        std::fs::write(b_dir.join("module.json"), serde_json::to_vec(&m).unwrap()).unwrap();
+        let err = load_modules_from_dir(tmp.path()).unwrap_err();
+        assert!(matches!(err, SchemaError::DuplicateModuleId { .. }));
+    }
+}
diff --git a/02_ruway/nahual/libs/meta-schema/tests/example_modules.rs b/02_ruway/nahual/libs/meta-schema/tests/example_modules.rs
new file mode 100644
index 0000000..12bdca6
--- /dev/null
+++ b/02_ruway/nahual/libs/meta-schema/tests/example_modules.rs
@@ -0,0 +1,99 @@
+//! Validación de los módulos demo que trae el shell `nakui-ui-llimphi`
+//! en `01_yachay/nakui/nakui-ui-llimphi/examples/nakui-modules/`.
+//!
+//! Si esto está verde, garantizamos que un usuario que clone el repo y
+//! corra `NAKUI_MODULES_DIR=01_yachay/nakui/nakui-ui-llimphi/examples/nakui-modules
+//! cargo run -p nakui-ui-llimphi` va a obtener los módulos cargados sin
+//! tocar nada.
+
+use nahual_meta_schema::{load_modules_from_dir, FieldKind, View};
+
+fn examples_dir() -> std::path::PathBuf {
+    // El crate vive en `02_ruway/nahual/libs/meta-schema`; el repo root
+    // queda 4 niveles arriba. Los módulos demo viven junto al shell.
+    let here = std::path::Path::new(env!("CARGO_MANIFEST_DIR"));
+    here.join("../../../..")
+        .join("01_yachay/nakui/nakui-ui-llimphi/examples/nakui-modules")
+}
+
+#[test]
+fn loads_demo_modules() {
+    let dir = examples_dir();
+    let mods = load_modules_from_dir(&dir).unwrap_or_else(|e| {
+        panic!("load failed for {}: {e}", dir.display());
+    });
+    let ids: Vec<&str> = mods.iter().map(|m| m.id.as_str()).collect();
+    assert_eq!(
+        ids,
+        vec!["tesoro", "ventas"],
+        "se esperaban los módulos demo 'tesoro' (tesorería) y 'ventas'"
+    );
+}
+
+#[test]
+fn every_demo_module_has_list_and_form_views() {
+    let mods = load_modules_from_dir(examples_dir()).unwrap();
+    for m in &mods {
+        let mut has_list = false;
+        let mut has_form = false;
+        for v in m.views.values() {
+            match v {
+                View::List(_) => has_list = true,
+                View::Form(_) => has_form = true,
+                View::Detail(_) | View::Dashboard(_) | View::Report(_) | View::Graph(_) => {}
+            }
+        }
+        assert!(
+            has_list && has_form,
+            "module {} should expose at least one list + one form view",
+            m.id
+        );
+    }
+}
+
+#[test]
+fn ventas_has_dashboard_and_report_views() {
+    let mods = load_modules_from_dir(examples_dir()).unwrap();
+    let ventas = mods.iter().find(|m| m.id == "ventas").expect("ventas");
+    let has_dashboard = ventas.views.values().any(|v| matches!(v, View::Dashboard(_)));
+    let has_report = ventas.views.values().any(|v| matches!(v, View::Report(_)));
+    assert!(has_dashboard, "ventas debería tener un tablero");
+    assert!(has_report, "ventas debería tener un reporte");
+}
+
+#[test]
+fn every_demo_form_field_kind_is_recognized() {
+    // Sanity: ningún módulo demo usa un kind que no esté en el enum
+    // (sería rechazado al parsear, pero check explícito no daña).
+    let mods = load_modules_from_dir(examples_dir()).unwrap();
+    for m in &mods {
+        for v in m.views.values() {
+            if let View::Form(form) = v {
+                for f in &form.fields {
+                    let _ok = matches!(
+                        f.kind,
+                        FieldKind::Text
+                            | FieldKind::Multiline
+                            | FieldKind::Number
+                            | FieldKind::Boolean
+                            | FieldKind::Date
+                            | FieldKind::Select
+                            | FieldKind::EntityRef
+                            | FieldKind::AutoId
+                    );
+                }
+            }
+        }
+    }
+}
+
+#[test]
+fn every_module_validates_clean() {
+    // validate() chequea que cada MenuItem.view exista en views y que
+    // los row_detail apunten a una vista Detail. Un typo haría fallar.
+    let mods = load_modules_from_dir(examples_dir()).unwrap();
+    for m in &mods {
+        m.validate()
+            .unwrap_or_else(|e| panic!("module {} failed validate: {e}", m.id));
+    }
+}
diff --git a/02_ruway/nahual/nahual-archive-viewer-llimphi/Cargo.toml b/02_ruway/nahual/nahual-archive-viewer-llimphi/Cargo.toml
new file mode 100644
index 0000000..cc82daa
--- /dev/null
+++ b/02_ruway/nahual/nahual-archive-viewer-llimphi/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "nahual-archive-viewer-llimphi"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+authors.workspace = true
+publish.workspace = true
+description = "nahual-archive-viewer-llimphi — visor de archivos comprimidos sobre Llimphi. Lista las entradas (nombres, tamaño, ratio) de ZIP (y su familia .jar/.apk/.epub/.docx/.xlsx/.pptx), tar y tar.gz en vez del volcado hex. Décimo visor del shell nahual."
+
+[dependencies]
+nahual-viewer-core = { workspace = true }
+llimphi-ui = { workspace = true }
+llimphi-theme = { workspace = true }
diff --git a/02_ruway/nahual/nahual-archive-viewer-llimphi/src/lib.rs b/02_ruway/nahual/nahual-archive-viewer-llimphi/src/lib.rs
new file mode 100644
index 0000000..ed1f8ab
--- /dev/null
+++ b/02_ruway/nahual/nahual-archive-viewer-llimphi/src/lib.rs
@@ -0,0 +1,147 @@
+//! `nahual-archive-viewer-llimphi` — visor de archivos comprimidos.
+//!
+//! Décimo visor del shell meta-app. Un `.zip`/`.tar`/`.tar.gz` lo detecta
+//! `shuma-discern` por su magic, pero hasta ahora caían al **hex viewer**
+//! (o al texto) — bytes ilegibles. Un archivo comprimido es un
+//! *contenedor*: lo útil es ver qué hay **dentro**, no su entropía. Este
+//! visor lista cada entrada con su tamaño (y, para ZIP, su ratio).
+//!
+//! Soporta tres formatos, decidido por el **contenido** (no la extensión):
+//! - **ZIP** (`PK`): lee el directorio central con `by_index_raw`, sin
+//!   descomprimir. Cubre la familia entera — `.jar`/`.apk`/`.epub` y los
+//!   ofimáticos OOXML (`.docx`/`.xlsx`/`.pptx`) son ZIPs.
+//! - **tar** (`ustar` en off 257): recorre los headers en streaming.
+//! - **tar.gz** (`1f 8b`): descomprime en streaming con `flate2` y recorre
+//!   el tar interno; salta los datos de cada entrada (sólo lee headers),
+//!   así no carga el archivo entero en memoria.
+//!
+//! Patrón fino de los otros viewers: carga sync en [`load_archive`],
+//! render en [`archive_viewer_view`]. No conoce el AppBus: el caller
+//! pasa el path. MVP feo-primero: la lista es un bloque de texto
+//! monoespaciado, estático (sin extraer entradas con click todavía).
+
+#![forbid(unsafe_code)]
+
+use std::path::Path;
+
+use llimphi_ui::llimphi_layout::taffy::{
+    prelude::{length, percent, FlexDirection, Size, Style},
+    AlignItems, Rect,
+};
+use llimphi_ui::llimphi_raster::peniko::Color;
+use llimphi_ui::llimphi_text::Alignment;
+use llimphi_ui::View;
+
+// El dominio (parseo + tipos) vive en `nahual-viewer-core`; lo
+// re-exportamos para no romper a los consumidores.
+pub use nahual_viewer_core::archive::*;
+
+/// Paleta del viewer.
+#[derive(Debug, Clone, Copy)]
+pub struct ArchiveViewerPalette {
+    pub bg: Color,
+    pub fg_text: Color,
+    pub fg_muted: Color,
+    pub fg_error: Color,
+}
+
+impl Default for ArchiveViewerPalette {
+    fn default() -> Self {
+        Self::from_theme(&llimphi_theme::Theme::dark())
+    }
+}
+
+impl ArchiveViewerPalette {
+    pub fn from_theme(t: &llimphi_theme::Theme) -> Self {
+        Self {
+            bg: t.bg_app,
+            fg_text: t.fg_text,
+            fg_muted: t.fg_muted,
+            fg_error: t.fg_destructive,
+        }
+    }
+}
+
+/// Pinta header (nombre del archivo) + body con el listado monoespaciado.
+pub fn archive_viewer_view<Msg>(
+    state: &ArchivePreview,
+    path: Option<&Path>,
+    palette: &ArchiveViewerPalette,
+) -> View<Msg>
+where
+    Msg: Clone + 'static,
+{
+    let header_text = match path {
+        Some(p) => format!(
+            "archive · {}",
+            p.file_name()
+                .map(|s| s.to_string_lossy().to_string())
+                .unwrap_or_else(|| p.display().to_string())
+        ),
+        None => "(seleccioná un ZIP/tar/tar.gz)".to_string(),
+    };
+
+    let header = View::new(Style {
+        size: Size {
+            width: percent(1.0_f32),
+            height: length(20.0_f32),
+        },
+        padding: Rect {
+            left: length(12.0_f32),
+            right: length(12.0_f32),
+            top: length(0.0_f32),
+            bottom: length(0.0_f32),
+        },
+        align_items: Some(AlignItems::Center),
+        ..Default::default()
+    })
+    .text_aligned(header_text, 10.0, palette.fg_muted, Alignment::Start);
+
+    let (body_text, body_color) = match state {
+        ArchivePreview::Empty => ("—".to_string(), palette.fg_muted),
+        ArchivePreview::Listing(l) => (render_listing(l), palette.fg_text),
+        ArchivePreview::Error(e) => (format!("(no se pudo abrir: {e})"), palette.fg_error),
+    };
+
+    let body = View::new(Style {
+        flex_grow: 1.0,
+        size: Size {
+            width: percent(1.0_f32),
+            height: percent(1.0_f32),
+        },
+        padding: Rect {
+            left: length(12.0_f32),
+            right: length(12.0_f32),
+            top: length(6.0_f32),
+            bottom: length(12.0_f32),
+        },
+        ..Default::default()
+    })
+    .text_aligned_full(
+        body_text,
+        12.0,
+        body_color,
+        Alignment::Start,
+        false,
+        Some("monospace".to_string()),
+    );
+
+    View::new(Style {
+        flex_direction: FlexDirection::Column,
+        flex_grow: 1.0,
+        size: Size {
+            width: percent(1.0_f32),
+            height: percent(1.0_f32),
+        },
+        padding: Rect {
+            left: length(0.0_f32),
+            right: length(0.0_f32),
+            top: length(6.0_f32),
+            bottom: length(0.0_f32),
+        },
+        ..Default::default()
+    })
+    .fill(palette.bg)
+    .clip(true)
+    .children(vec![header, body])
+}
diff --git a/02_ruway/nahual/nahual-audio-viewer-llimphi/Cargo.toml b/02_ruway/nahual/nahual-audio-viewer-llimphi/Cargo.toml
new file mode 100644
index 0000000..65faa87
--- /dev/null
+++ b/02_ruway/nahual/nahual-audio-viewer-llimphi/Cargo.toml
@@ -0,0 +1,25 @@
+[package]
+name = "nahual-audio-viewer-llimphi"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+authors.workspace = true
+publish.workspace = true
+description = "nahual-audio-viewer-llimphi — reproductor/visor de audio sobre Llimphi. Decodifica WAV/MP3/FLAC/Opus/Vorbis (media-source-*), reproduce por cpal (media-audio-cpal) y pinta un espectro log-band en vivo vía AudioProbe + Spectrum. Quinto visor del shell nahual."
+
+[dependencies]
+llimphi-ui = { workspace = true }
+llimphi-theme = { workspace = true }
+media-core = { workspace = true }
+media-audio-cpal = { workspace = true }
+media-source-wav = { workspace = true }
+media-source-mp3 = { workspace = true }
+media-source-flac = { workspace = true }
+media-source-opus = { workspace = true }
+media-source-vorbis = { workspace = true }
+parking_lot = { workspace = true }
+
+[[example]]
+name = "audio_viewer_demo"
+path = "examples/audio_viewer_demo.rs"
diff --git a/02_ruway/nahual/nahual-audio-viewer-llimphi/examples/audio_viewer_demo.rs b/02_ruway/nahual/nahual-audio-viewer-llimphi/examples/audio_viewer_demo.rs
new file mode 100644
index 0000000..439d188
--- /dev/null
+++ b/02_ruway/nahual/nahual-audio-viewer-llimphi/examples/audio_viewer_demo.rs
@@ -0,0 +1,81 @@
+//! Showcase de `nahual-audio-viewer-llimphi`.
+//!
+//! `cargo run -p nahual-audio-viewer-llimphi --example audio_viewer_demo --release -- /path/clip.mp3`
+//!
+//! Sin argumento abre nada (placeholder); con un archivo WAV/MP3/FLAC/
+//! Opus/OGG lo reproduce y muestra el espectro. Espacio: play/pausa.
+
+use std::path::PathBuf;
+use std::time::Duration;
+
+use llimphi_ui::llimphi_layout::taffy::prelude::{percent, Size, Style};
+use llimphi_ui::{App, Handle, Key, KeyEvent, KeyState, NamedKey, View};
+use nahual_audio_viewer_llimphi::{audio_viewer_view, AudioViewerPalette, AudioViewerState};
+
+const TICK: Duration = Duration::from_millis(33); // ~30 Hz
+
+struct Model {
+    state: AudioViewerState,
+}
+
+#[derive(Clone)]
+enum Msg {
+    Tick,
+    TogglePlay,
+}
+
+struct Showcase;
+
+impl App for Showcase {
+    type Model = Model;
+    type Msg = Msg;
+
+    fn title() -> &'static str {
+        "llimphi · audio viewer showcase"
+    }
+
+    fn initial_size() -> (u32, u32) {
+        (820, 420)
+    }
+
+    fn init(handle: &Handle<Msg>) -> Model {
+        handle.spawn_periodic(TICK, || Msg::Tick);
+        let state = match std::env::args().nth(1).map(PathBuf::from) {
+            Some(p) => AudioViewerState::open(&p),
+            None => AudioViewerState::default(),
+        };
+        Model { state }
+    }
+
+    fn on_key(_model: &Model, e: &KeyEvent) -> Option<Msg> {
+        if e.state == KeyState::Pressed && matches!(&e.key, Key::Named(NamedKey::Space)) {
+            return Some(Msg::TogglePlay);
+        }
+        None
+    }
+
+    fn update(mut model: Model, msg: Msg, _: &Handle<Msg>) -> Model {
+        match msg {
+            Msg::Tick => model.state.tick(TICK),
+            Msg::TogglePlay => model.state.toggle_play(),
+        }
+        model
+    }
+
+    fn view(model: &Model) -> View<Msg> {
+        let palette = AudioViewerPalette::default();
+        let viewer = audio_viewer_view::<Msg>(&model.state, &palette);
+        View::new(Style {
+            size: Size {
+                width: percent(1.0_f32),
+                height: percent(1.0_f32),
+            },
+            ..Default::default()
+        })
+        .children(vec![viewer])
+    }
+}
+
+fn main() {
+    llimphi_ui::run::<Showcase>();
+}
diff --git a/02_ruway/nahual/nahual-audio-viewer-llimphi/src/lib.rs b/02_ruway/nahual/nahual-audio-viewer-llimphi/src/lib.rs
new file mode 100644
index 0000000..a8d18da
--- /dev/null
+++ b/02_ruway/nahual/nahual-audio-viewer-llimphi/src/lib.rs
@@ -0,0 +1,467 @@
+//! `nahual-audio-viewer-llimphi` — reproductor/visor de audio.
+//!
+//! Quinto visor del shell meta-app (tras texto/imagen/video/card). Abre
+//! un archivo de audio (WAV/MP3/FLAC/Opus/Vorbis vía `media-source-*`),
+//! lo reproduce por el sink cpal (`media-audio-cpal`) y pinta un
+//! **espectro en vivo** — bandas log-espaciadas calculadas con el
+//! `Spectrum` (Goertzel) de `media-core` sobre los samples que un
+//! `AudioProbe` tapa del stream realtime.
+//!
+//! ## Cómo se sostiene el stream
+//!
+//! El [`AudioSink`] envuelve un `cpal::Stream` que es `!Send`/`!Sync` —
+//! por eso vive **dentro** del estado del visor (que la app guarda en su
+//! `Model`, sólo `'static`, no `Send`). Soltar el `AudioViewerState`
+//! (cambiar de archivo, navegar a otra cosa) dropea el sink y para el
+//! audio. No hay statics ni leaks: un visor = un stream.
+//!
+//! ## Posición
+//!
+//! La cadena `AudioSource → sink` está type-erased detrás de un
+//! `Arc<Mutex<dyn AudioSource>>`, así que el visor NO lee `Seekable` de
+//! la fuente: estima el playhead con su propio reloj (acumula `dt` en
+//! [`AudioViewerState::tick`], como el video viewer). Es suficiente para
+//! un meter; el seek real llegará cuando la cadena exponga `Seekable`.
+
+#![forbid(unsafe_code)]
+
+use std::path::Path;
+use std::sync::Arc;
+use std::time::Duration;
+
+use parking_lot::Mutex;
+
+use llimphi_ui::llimphi_layout::taffy::{
+    prelude::{length, percent, FlexDirection, Size, Style},
+    AlignItems, Rect,
+};
+use llimphi_ui::llimphi_raster::kurbo::{Affine, Rect as KurboRect};
+use llimphi_ui::llimphi_raster::peniko::{Color, Fill};
+use llimphi_ui::llimphi_text::Alignment;
+use llimphi_ui::View;
+
+use media_audio_cpal::AudioSink;
+use media_core::{AudioProbe, AudioSource, Pause, PausableAudio, ProbedAudioSource, Spectrum};
+
+/// Cantidad de bandas del espectro y su rango (Hz). 48 bandas entre
+/// 40 Hz y 16 kHz es un compromiso legible: cubre el grueso musical sin
+/// barras tan finas que no se distingan.
+const SPECTRUM_BANDS: usize = 48;
+const SPECTRUM_FMIN: f32 = 40.0;
+const SPECTRUM_FMAX: f32 = 16_000.0;
+/// Capacidad del ring del probe (samples intercalados). ≈ 8k da una
+/// ventana de ~85 ms a 48 kHz stereo — responsivo sin titilar.
+const PROBE_CAPACITY: usize = 8 * 1024;
+
+/// Estado del reproductor de audio. No es `Clone` (ni `Send`): contiene
+/// el `AudioSink`/`cpal::Stream`. La app lo guarda en su `Model`.
+pub struct AudioViewerState {
+    /// Mantiene vivo el stream cpal. `None` si no se pudo abrir.
+    _sink: Option<AudioSink>,
+    /// Tap de samples del stream para el espectro.
+    probe: AudioProbe,
+    /// Analizador log-band (Goertzel + release suave).
+    spectrum: Spectrum,
+    /// Buffer reusado para el snapshot del probe (evita realloc/tick).
+    scratch: Vec<f32>,
+    /// Handle de pausa compartido con el `PausableAudio` de la cadena.
+    pause: Pause,
+    name: String,
+    sample_rate: u32,
+    channels: u16,
+    duration: Option<Duration>,
+    position: Duration,
+    playing: bool,
+    error: Option<String>,
+}
+
+impl Default for AudioViewerState {
+    fn default() -> Self {
+        Self {
+            _sink: None,
+            probe: AudioProbe::new(PROBE_CAPACITY),
+            spectrum: Spectrum::log_bands(SPECTRUM_BANDS, SPECTRUM_FMIN, SPECTRUM_FMAX),
+            scratch: Vec::new(),
+            pause: Pause::new(),
+            name: String::new(),
+            sample_rate: 0,
+            channels: 0,
+            duration: None,
+            position: Duration::ZERO,
+            playing: false,
+            error: None,
+        }
+    }
+}
+
+/// Una fuente de audio ya decodificada + sus metadatos de presentación.
+/// La fuente se boxea para borrar el tipo concreto antes de entrar al
+/// `Arc<Mutex<dyn AudioSource>>` que el sink consume.
+struct DecodedAudio {
+    source: Box<dyn AudioSource + Send>,
+    channels: u16,
+    sample_rate: u32,
+    duration: Duration,
+}
+
+impl AudioViewerState {
+    /// Abre y reproduce un archivo de audio. La extensión elige el
+    /// decoder; el contenido ya fue discernido como audio por el shell.
+    /// Si falla el decode o el sink, queda en estado de error (lo
+    /// muestra el header) y sin sonido.
+    pub fn open(path: &Path) -> Self {
+        let name = path
+            .file_name()
+            .map(|s| s.to_string_lossy().to_string())
+            .unwrap_or_default();
+
+        let decoded = match decode(path) {
+            Ok(d) => d,
+            Err(e) => {
+                return Self {
+                    name,
+                    error: Some(e),
+                    ..Default::default()
+                };
+            }
+        };
+
+        let probe = AudioProbe::new(PROBE_CAPACITY);
+        let pause = Pause::new();
+        // Orden de la cadena: pausa primero (en pausa rellena silencio),
+        // probe después → el espectro ve silencio y decae al pausar.
+        let pausable = PausableAudio::new(decoded.source, pause.clone());
+        let probed = ProbedAudioSource::new(pausable, probe.clone());
+        let source: Arc<Mutex<dyn AudioSource + Send>> = Arc::new(Mutex::new(probed));
+
+        match AudioSink::open(source) {
+            Ok(sink) => Self {
+                _sink: Some(sink),
+                probe,
+                spectrum: Spectrum::log_bands(SPECTRUM_BANDS, SPECTRUM_FMIN, SPECTRUM_FMAX),
+                scratch: Vec::new(),
+                pause,
+                name,
+                sample_rate: decoded.sample_rate,
+                channels: decoded.channels,
+                duration: Some(decoded.duration),
+                position: Duration::ZERO,
+                playing: true,
+                error: None,
+            },
+            Err(e) => Self {
+                name,
+                error: Some(format!("sin salida de audio: {e}")),
+                ..Default::default()
+            },
+        }
+    }
+
+    pub fn position(&self) -> Duration {
+        self.position
+    }
+
+    pub fn duration(&self) -> Option<Duration> {
+        self.duration
+    }
+
+    pub fn is_playing(&self) -> bool {
+        self.playing
+    }
+
+    /// Play/pausa. Congela el stream (silencio) y detiene el avance del
+    /// reloj de posición.
+    pub fn toggle_play(&mut self) {
+        if self._sink.is_none() {
+            return;
+        }
+        self.pause.toggle();
+        self.playing = !self.playing;
+    }
+
+    /// Avanza el reloj y refresca el espectro con el último tramo del
+    /// stream. Sin efecto si está en pausa o en error.
+    pub fn tick(&mut self, dt: Duration) {
+        if !self.playing || self._sink.is_none() {
+            return;
+        }
+        let (sr, ch) = self.probe.snapshot(&mut self.scratch);
+        if sr > 0 {
+            self.spectrum.analyze(&self.scratch, ch, sr);
+        }
+        let next = self.position.saturating_add(dt);
+        self.position = match self.duration {
+            Some(d) if next > d => d,
+            _ => next,
+        };
+    }
+
+    /// Magnitudes actuales del espectro (una por banda, [0,1]).
+    pub fn magnitudes(&self) -> &[f32] {
+        self.spectrum.magnitudes()
+    }
+}
+
+/// Decodifica el archivo según extensión a una fuente de audio + metadatos.
+fn decode(path: &Path) -> Result<DecodedAudio, String> {
+    let ext = path
+        .extension()
+        .and_then(|s| s.to_str())
+        .map(str::to_ascii_lowercase);
+
+    macro_rules! build {
+        ($src:expr) => {{
+            let s = $src.map_err(|e| e.to_string())?;
+            DecodedAudio {
+                channels: s.source_channels(),
+                sample_rate: s.source_sample_rate(),
+                duration: Duration::from_secs_f32(s.duration_seconds().max(0.0)),
+                source: Box::new(s),
+            }
+        }};
+    }
+
+    let decoded = match ext.as_deref() {
+        Some("wav") => build!(media_source_wav::WavSource::from_path(path)),
+        Some("mp3") => build!(media_source_mp3::Mp3Source::from_path(path)),
+        Some("flac") => build!(media_source_flac::FlacSource::from_path(path)),
+        Some("opus") => build!(media_source_opus::OpusSource::from_path(path)),
+        Some("ogg" | "oga") => build!(media_source_vorbis::VorbisSource::from_path(path)),
+        other => {
+            return Err(format!(
+                "formato de audio no soportado: .{}",
+                other.unwrap_or("?")
+            ))
+        }
+    };
+    Ok(decoded)
+}
+
+/// Paleta del visor.
+#[derive(Debug, Clone, Copy)]
+pub struct AudioViewerPalette {
+    pub bg: Color,
+    pub fg: Color,
+    pub fg_muted: Color,
+    pub fg_error: Color,
+    pub accent: Color,
+}
+
+impl Default for AudioViewerPalette {
+    fn default() -> Self {
+        Self::from_theme(&llimphi_theme::Theme::dark())
+    }
+}
+
+impl AudioViewerPalette {
+    pub fn from_theme(t: &llimphi_theme::Theme) -> Self {
+        Self {
+            bg: t.bg_app,
+            fg: t.fg_text,
+            fg_muted: t.fg_muted,
+            fg_error: t.fg_destructive,
+            accent: t.accent,
+        }
+    }
+}
+
+fn fmt_time(d: Duration) -> String {
+    let total = d.as_secs();
+    format!("{:02}:{:02}", total / 60, total % 60)
+}
+
+/// Pinta header (nombre · rate/ch · ▶/⏸ · mm:ss/mm:ss) + body con el
+/// espectro (o un placeholder si no hay audio / hay error).
+pub fn audio_viewer_view<Msg>(
+    state: &AudioViewerState,
+    palette: &AudioViewerPalette,
+) -> View<Msg>
+where
+    Msg: Clone + 'static,
+{
+    let name = if state.name.is_empty() {
+        "(seleccioná un audio)".to_string()
+    } else {
+        state.name.clone()
+    };
+
+    let header_text = if let Some(e) = &state.error {
+        format!("{name} · error: {e}")
+    } else if state._sink.is_some() {
+        let glyph = if state.playing { "▶" } else { "⏸" };
+        let time = match state.duration {
+            Some(d) => format!("{} / {}", fmt_time(state.position), fmt_time(d)),
+            None => fmt_time(state.position),
+        };
+        format!(
+            "{name} · {} Hz · {} ch · {glyph} {time}",
+            state.sample_rate, state.channels
+        )
+    } else {
+        name
+    };
+
+    let header_color = if state.error.is_some() {
+        palette.fg_error
+    } else {
+        palette.fg_muted
+    };
+
+    let header = View::new(Style {
+        size: Size {
+            width: percent(1.0_f32),
+            height: length(20.0_f32),
+        },
+        padding: Rect {
+            left: length(12.0_f32),
+            right: length(12.0_f32),
+            top: length(0.0_f32),
+            bottom: length(0.0_f32),
+        },
+        align_items: Some(AlignItems::Center),
+        ..Default::default()
+    })
+    .text_aligned(header_text, 10.0, header_color, Alignment::Start);
+
+    let body = match (&state.error, state._sink.is_some()) {
+        (Some(e), _) => placeholder_body(&format!("(error: {e})"), palette.fg_error),
+        (None, true) => spectrum_body(state.magnitudes().to_vec(), palette),
+        (None, false) => placeholder_body("—", palette.fg_muted),
+    };
+
+    View::new(Style {
+        flex_direction: FlexDirection::Column,
+        flex_grow: 1.0,
+        size: Size {
+            width: percent(1.0_f32),
+            height: percent(1.0_f32),
+        },
+        padding: Rect {
+            left: length(0.0_f32),
+            right: length(0.0_f32),
+            top: length(6.0_f32),
+            bottom: length(0.0_f32),
+        },
+        ..Default::default()
+    })
+    .fill(palette.bg)
+    .clip(true)
+    .children(vec![header, body])
+}
+
+fn placeholder_body<Msg>(text: &str, color: Color) -> View<Msg>
+where
+    Msg: Clone + 'static,
+{
+    View::new(Style {
+        flex_grow: 1.0,
+        size: Size {
+            width: percent(1.0_f32),
+            height: percent(1.0_f32),
+        },
+        padding: Rect {
+            left: length(12.0_f32),
+            right: length(12.0_f32),
+            top: length(6.0_f32),
+            bottom: length(12.0_f32),
+        },
+        ..Default::default()
+    })
+    .text_aligned(text.to_string(), 12.0, color, Alignment::Center)
+}
+
+/// Pinta las barras del espectro de abajo hacia arriba. `mags` se mueve
+/// al closure (es chico: una banda por float) para que el painter sea
+/// `Send + Sync` sin compartir el `Spectrum` mutable.
+fn spectrum_body<Msg>(mags: Vec<f32>, palette: &AudioViewerPalette) -> View<Msg>
+where
+    Msg: Clone + 'static,
+{
+    let accent = palette.accent;
+    let track = palette.fg_muted;
+    View::new(Style {
+        flex_grow: 1.0,
+        size: Size {
+            width: percent(1.0_f32),
+            height: percent(1.0_f32),
+        },
+        padding: Rect {
+            left: length(12.0_f32),
+            right: length(12.0_f32),
+            top: length(8.0_f32),
+            bottom: length(12.0_f32),
+        },
+        ..Default::default()
+    })
+    .paint_with(move |scene, _ts, rect| {
+        if rect.w <= 4.0 || rect.h <= 4.0 || mags.is_empty() {
+            return;
+        }
+        let n = mags.len();
+        let slot_w = rect.w / n as f32;
+        let bar_w = (slot_w * 0.7).max(1.0);
+        let baseline = rect.y + rect.h;
+        for (i, &m) in mags.iter().enumerate() {
+            let x0 = rect.x + i as f32 * slot_w;
+            // Piso tenue de 1 px para que se vea la grilla aun en silencio.
+            let h = (m.clamp(0.0, 1.0) * rect.h).max(1.0);
+            let bar = KurboRect::new(
+                x0 as f64,
+                (baseline - h) as f64,
+                (x0 + bar_w) as f64,
+                baseline as f64,
+            );
+            // Mezcla accent→track según altura: barras altas más vivas.
+            let t = m.clamp(0.0, 1.0);
+            let color = lerp_color(track, accent, t);
+            scene.fill(Fill::NonZero, Affine::IDENTITY, color, None, &bar);
+        }
+    })
+}
+
+/// Interpola linealmente dos colores en sRGB (suficiente para un meter).
+fn lerp_color(a: Color, b: Color, t: f32) -> Color {
+    let t = t.clamp(0.0, 1.0);
+    let ca = a.to_rgba8();
+    let cb = b.to_rgba8();
+    let mix = |x: u8, y: u8| (x as f32 + (y as f32 - x as f32) * t) as u8;
+    Color::from_rgba8(
+        mix(ca.r, cb.r),
+        mix(ca.g, cb.g),
+        mix(ca.b, cb.b),
+        255,
+    )
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn fmt_time_basico() {
+        assert_eq!(fmt_time(Duration::from_secs(0)), "00:00");
+        assert_eq!(fmt_time(Duration::from_secs(125)), "02:05");
+    }
+
+    #[test]
+    fn open_inexistente_es_error() {
+        let st = AudioViewerState::open(Path::new("/no/existe.wav"));
+        assert!(st.error.is_some());
+        assert!(st._sink.is_none());
+        assert!(!st.is_playing());
+    }
+
+    #[test]
+    fn formato_desconocido_es_error() {
+        let st = AudioViewerState::open(Path::new("/x.xyz"));
+        assert!(st.error.is_some());
+    }
+
+    #[test]
+    fn estado_default_sin_audio() {
+        let st = AudioViewerState::default();
+        assert!(st._sink.is_none());
+        assert_eq!(st.position(), Duration::ZERO);
+        assert_eq!(st.magnitudes().len(), SPECTRUM_BANDS);
+    }
+}
diff --git a/02_ruway/nahual/nahual-card-viewer-llimphi/Cargo.toml b/02_ruway/nahual/nahual-card-viewer-llimphi/Cargo.toml
new file mode 100644
index 0000000..2d6dba2
--- /dev/null
+++ b/02_ruway/nahual/nahual-card-viewer-llimphi/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "nahual-card-viewer-llimphi"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+authors.workspace = true
+publish.workspace = true
+description = "nahual-card-viewer-llimphi — visor estructurado de Cards (shared/card) sobre Llimphi. Renderiza label/id/kind/payload/supervisión/capacidades/referencias como filas legibles en vez del JSON crudo. Análogo Llimphi del text/image/video viewer del shell nahual."
+
+[dependencies]
+nahual-viewer-core = { workspace = true }
+llimphi-ui = { workspace = true }
+llimphi-theme = { workspace = true }
+card-core = { workspace = true }
diff --git a/02_ruway/nahual/nahual-card-viewer-llimphi/src/lib.rs b/02_ruway/nahual/nahual-card-viewer-llimphi/src/lib.rs
new file mode 100644
index 0000000..d5315a3
--- /dev/null
+++ b/02_ruway/nahual/nahual-card-viewer-llimphi/src/lib.rs
@@ -0,0 +1,148 @@
+//! `nahual-card-viewer-llimphi` — visor estructurado de Cards.
+//!
+//! Cuarto visor del shell meta-app (tras texto/imagen/video). Una Card
+//! (`shared/card`) es JSON, así que el text viewer la abriría como tal;
+//! pero el `lens` `card` que `shuma-discern` produce sobre su contenido
+//! merece un visor que la **presente** — no el blob crudo. Este crate
+//! lee la Card, extrae los campos salientes (identidad, naturaleza,
+//! payload, supervisión, capacidades, permisos, referencias) y los pinta
+//! como filas legibles.
+//!
+//! Sigue el patrón fino de los otros viewers: la carga vive en
+//! [`load_card`] (sync — una Card es chica), el render en
+//! [`card_viewer_view`]. No conoce el AppBus: el caller pasa el path.
+//!
+//! MVP feo-primero: el cuerpo es un bloque de texto `clave  valor` por
+//! línea, no una tabla con layout. Es legible y autocontenido; cuando un
+//! widget de propiedades reusable exista en el elegance kit, se migra.
+
+#![forbid(unsafe_code)]
+
+use std::path::Path;
+
+use card_core::CardKind;
+use llimphi_ui::llimphi_layout::taffy::{
+    prelude::{length, percent, FlexDirection, Size, Style},
+    AlignItems, Rect,
+};
+use llimphi_ui::llimphi_raster::peniko::Color;
+use llimphi_ui::llimphi_text::Alignment;
+use llimphi_ui::View;
+
+// El dominio (parseo + tipos) vive en `nahual-viewer-core`; lo
+// re-exportamos para no romper a los consumidores.
+pub use nahual_viewer_core::card::*;
+
+/// Paleta del visor. Reusa los slots semánticos del tema.
+#[derive(Debug, Clone, Copy)]
+pub struct CardViewerPalette {
+    pub bg: Color,
+    pub fg_text: Color,
+    pub fg_muted: Color,
+    pub fg_error: Color,
+    pub accent: Color,
+}
+
+impl Default for CardViewerPalette {
+    fn default() -> Self {
+        Self::from_theme(&llimphi_theme::Theme::dark())
+    }
+}
+
+impl CardViewerPalette {
+    pub fn from_theme(t: &llimphi_theme::Theme) -> Self {
+        Self {
+            bg: t.bg_app,
+            fg_text: t.fg_text,
+            fg_muted: t.fg_muted,
+            fg_error: t.fg_destructive,
+            accent: t.accent,
+        }
+    }
+}
+
+/// Pinta header (label · naturaleza) + body con las filas de la Card.
+pub fn card_viewer_view<Msg>(
+    state: &CardPreview,
+    path: Option<&Path>,
+    palette: &CardViewerPalette,
+) -> View<Msg>
+where
+    Msg: Clone + 'static,
+{
+    let header_text = match state {
+        CardPreview::Card(c) => {
+            let kind = match c.kind {
+                CardKind::Ente => "ente",
+                CardKind::Data => "data",
+            };
+            format!("card · {} · {kind}", c.label)
+        }
+        _ => match path {
+            Some(p) => format!(
+                "card · {}",
+                p.file_name()
+                    .map(|s| s.to_string_lossy().to_string())
+                    .unwrap_or_else(|| p.display().to_string())
+            ),
+            None => "(seleccioná una card)".to_string(),
+        },
+    };
+
+    let header = View::new(Style {
+        size: Size {
+            width: percent(1.0_f32),
+            height: length(20.0_f32),
+        },
+        padding: Rect {
+            left: length(12.0_f32),
+            right: length(12.0_f32),
+            top: length(0.0_f32),
+            bottom: length(0.0_f32),
+        },
+        align_items: Some(AlignItems::Center),
+        ..Default::default()
+    })
+    .text_aligned(header_text, 10.0, palette.accent, Alignment::Start);
+
+    let (body_text, body_color) = match state {
+        CardPreview::Empty => ("—".to_string(), palette.fg_muted),
+        CardPreview::Card(c) => (summarize(c), palette.fg_text),
+        CardPreview::Error(e) => (format!("(card inválida: {e})"), palette.fg_error),
+    };
+
+    let body = View::new(Style {
+        flex_grow: 1.0,
+        size: Size {
+            width: percent(1.0_f32),
+            height: percent(1.0_f32),
+        },
+        padding: Rect {
+            left: length(12.0_f32),
+            right: length(12.0_f32),
+            top: length(6.0_f32),
+            bottom: length(12.0_f32),
+        },
+        ..Default::default()
+    })
+    .text_aligned(body_text, 12.0, body_color, Alignment::Start);
+
+    View::new(Style {
+        flex_direction: FlexDirection::Column,
+        flex_grow: 1.0,
+        size: Size {
+            width: percent(1.0_f32),
+            height: percent(1.0_f32),
+        },
+        padding: Rect {
+            left: length(0.0_f32),
+            right: length(0.0_f32),
+            top: length(6.0_f32),
+            bottom: length(0.0_f32),
+        },
+        ..Default::default()
+    })
+    .fill(palette.bg)
+    .clip(true)
+    .children(vec![header, body])
+}
diff --git a/02_ruway/nahual/nahual-file-explorer-llimphi/Cargo.toml b/02_ruway/nahual/nahual-file-explorer-llimphi/Cargo.toml
new file mode 100644
index 0000000..c33c72b
--- /dev/null
+++ b/02_ruway/nahual/nahual-file-explorer-llimphi/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "nahual-file-explorer-llimphi"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+authors.workspace = true
+publish.workspace = true
+description = "nahual-file-explorer-llimphi — explorador de directorios sobre Llimphi. Crate fino con la lógica de scan/navigation (cwd + Vec<Entry> + selected + visible_offset + wheel_accum) en `FileExplorerState` y un `file_explorer_view` que pinta la lista virtualizada con `llimphi-widget-list`."
+
+[dependencies]
+llimphi-ui = { workspace = true }
+llimphi-theme = { workspace = true }
+llimphi-widget-list = { workspace = true }
diff --git a/02_ruway/nahual/nahual-file-explorer-llimphi/LEEME.md b/02_ruway/nahual/nahual-file-explorer-llimphi/LEEME.md
new file mode 100644
index 0000000..047977c
--- /dev/null
+++ b/02_ruway/nahual/nahual-file-explorer-llimphi/LEEME.md
@@ -0,0 +1,15 @@
+# nahual-file-explorer-llimphi
+
+> File explorer con tree + previews de [nahual](../README.md).
+
+Tree de directorios a la izquierda, contenido + preview a la derecha. Preview por tipo: texto, imagen, MD, code.
+
+## Uso
+
+```sh
+cargo run --release -p nahual-file-explorer-llimphi
+```
+
+## Deps
+
+- [`llimphi-widget-tree`](../../llimphi/widgets/tree/README.md), [`splitter`](../../llimphi/widgets/splitter/README.md)
diff --git a/02_ruway/nahual/nahual-file-explorer-llimphi/README.md b/02_ruway/nahual/nahual-file-explorer-llimphi/README.md
new file mode 100644
index 0000000..bff4cda
--- /dev/null
+++ b/02_ruway/nahual/nahual-file-explorer-llimphi/README.md
@@ -0,0 +1,15 @@
+# nahual-file-explorer-llimphi
+
+> File explorer with tree + previews of [nahual](../README.md).
+
+Tree of directories on the left, content + preview on the right. Preview by type: text, image, MD, code.
+
+## Usage
+
+```sh
+cargo run --release -p nahual-file-explorer-llimphi
+```
+
+## Deps
+
+- [`llimphi-widget-tree`](../../llimphi/widgets/tree/README.md), [`splitter`](../../llimphi/widgets/splitter/README.md)
diff --git a/02_ruway/nahual/nahual-file-explorer-llimphi/src/lib.rs b/02_ruway/nahual/nahual-file-explorer-llimphi/src/lib.rs
new file mode 100644
index 0000000..60b6530
--- /dev/null
+++ b/02_ruway/nahual/nahual-file-explorer-llimphi/src/lib.rs
@@ -0,0 +1,287 @@
+//! `nahual-file-explorer-llimphi` — explorador de directorios sobre
+//! Llimphi.
+//!
+//! Reemplazo Llimphi del `nahual-file-explorer` GPUI. Crate fino que
+//! encapsula:
+//! - [`Entry`] / [`FileExplorerState`] — modelo (cwd, entries,
+//!   selección, scroll, ancho del pane si aplica).
+//! - Transiciones puras: [`FileExplorerState::up`], `down`,
+//!   `open_selected`, `parent`, `select`, `scroll` y `apply_wheel`
+//!   (cada una devuelve un boolean o un [`OpenedFile`] que el caller
+//!   usa para decidir si previsualizar/abrir).
+//! - [`file_explorer_view`] — pinta la lista virtualizada con
+//!   `llimphi-widget-list`, devolviendo Msgs vía un mapper de
+//!   `usize` (índice fila) a `Msg` que el caller provee.
+//!
+//! El estado es puro: no abre archivos, no llama a `fs::read` —
+//! sólo navega. La lectura/preview es responsabilidad del consumidor
+//! (`nahual-text-viewer-llimphi`, `nahual-image-viewer-llimphi`,
+//! etc.). Reaccionar a `OpenedFile` es típicamente "cargar preview
+//! con `load_preview`/`load_image` y guardarlo en mi modelo".
+
+#![forbid(unsafe_code)]
+
+use std::cmp::min;
+use std::fs;
+use std::path::{Path, PathBuf};
+
+use llimphi_ui::View;
+use llimphi_widget_list::{list_view, ListPalette, ListRow, ListSpec};
+
+/// Una entrada del directorio actual.
+#[derive(Clone, Debug)]
+pub struct Entry {
+    pub name: String,
+    pub is_dir: bool,
+}
+
+/// Cuántas filas mostramos a la vez. Calibrado para un viewport típico
+/// (alto del pane ≈ 760 px ÷ 22 px/row ≈ 34 filas). El caller puede
+/// crear el state con otro valor si tiene viewports distintos.
+pub const DEFAULT_VISIBLE_ROWS: usize = 32;
+/// Alto en px de cada fila. Lo usa `ListSpec`.
+pub const DEFAULT_ROW_HEIGHT: f32 = 22.0;
+/// "Líneas" de la rueda que equivalen a una fila.
+pub const WHEEL_LINES_PER_ROW: f32 = 1.0;
+
+/// Resultado de [`FileExplorerState::open_selected`]: si la selección
+/// es un directorio, ya se hizo el `cd` (`Directory`); si es archivo,
+/// devuelve el path para que el caller decida qué hacer (preview,
+/// abrir con app externa, etc.).
+#[derive(Clone, Debug)]
+pub enum OpenedFile {
+    Directory,
+    File(PathBuf),
+}
+
+/// Estado del explorador. Puro: mutarlo es trivial y no toca IO
+/// excepto en `cd` (que sí relee el directorio nuevo). El caller lo
+/// mantiene en su `Model` y pasa `&mut state` a las transiciones.
+pub struct FileExplorerState {
+    pub cwd: PathBuf,
+    pub entries: Vec<Entry>,
+    pub selected: usize,
+    pub visible_offset: usize,
+    /// Acumulador fraccional de la rueda — para touchpads que mandan
+    /// deltas chicos. `apply_wheel` lo lee, calcula los pasos enteros
+    /// y deja la fracción residual.
+    pub wheel_accum: f32,
+    pub visible_rows: usize,
+}
+
+impl FileExplorerState {
+    /// Construye un explorador anclado en `cwd`. Si el path no se
+    /// puede leer, las entries quedan vacías; mostrar mensaje queda
+    /// para el caller.
+    pub fn new(cwd: PathBuf) -> Self {
+        let entries = scan_dir(&cwd);
+        Self {
+            cwd,
+            entries,
+            selected: 0,
+            visible_offset: 0,
+            wheel_accum: 0.0,
+            visible_rows: DEFAULT_VISIBLE_ROWS,
+        }
+    }
+
+    /// El path resultante de combinar `cwd` con la entrada
+    /// seleccionada. `None` si no hay selección válida.
+    pub fn selected_path(&self) -> Option<PathBuf> {
+        self.entries
+            .get(self.selected)
+            .map(|e| self.cwd.join(&e.name))
+    }
+
+    /// La entrada actualmente seleccionada (clonada).
+    pub fn selected_entry(&self) -> Option<Entry> {
+        self.entries.get(self.selected).cloned()
+    }
+
+    /// Mueve la selección una fila arriba si se puede.
+    pub fn up(&mut self) -> bool {
+        if self.selected == 0 {
+            return false;
+        }
+        self.selected -= 1;
+        self.sync_offset();
+        true
+    }
+
+    /// Mueve la selección una fila abajo si se puede.
+    pub fn down(&mut self) -> bool {
+        if self.selected + 1 >= self.entries.len() {
+            return false;
+        }
+        self.selected += 1;
+        self.sync_offset();
+        true
+    }
+
+    /// Selecciona la entrada en `idx` (con bound check + scroll sync).
+    pub fn select(&mut self, idx: usize) -> bool {
+        if idx >= self.entries.len() {
+            return false;
+        }
+        self.selected = idx;
+        self.sync_offset();
+        true
+    }
+
+    /// Si la selección es un directorio, hace `cd` (relee entries,
+    /// resetea selección/offset). Si es archivo, devuelve su path.
+    pub fn open_selected(&mut self) -> Option<OpenedFile> {
+        let entry = self.entries.get(self.selected).cloned()?;
+        if entry.is_dir {
+            let new_cwd = self.cwd.join(&entry.name);
+            // Canonicalize cuando se pueda: resuelve symlinks y "..".
+            // Si falla (permisos), nos quedamos con el join textual.
+            self.cwd = fs::canonicalize(&new_cwd).unwrap_or(new_cwd);
+            self.entries = scan_dir(&self.cwd);
+            self.selected = 0;
+            self.visible_offset = 0;
+            Some(OpenedFile::Directory)
+        } else {
+            Some(OpenedFile::File(self.cwd.join(&entry.name)))
+        }
+    }
+
+    /// Sube al directorio padre. Si estaba parado sobre un subdir, lo
+    /// re-selecciona al subir (UX típica: mantenés contexto).
+    pub fn parent(&mut self) -> bool {
+        let Some(parent) = self.cwd.parent().map(Path::to_path_buf) else {
+            return false;
+        };
+        let prev_name = self
+            .cwd
+            .file_name()
+            .map(|s| s.to_string_lossy().to_string());
+        self.cwd = parent;
+        self.entries = scan_dir(&self.cwd);
+        self.selected = prev_name
+            .and_then(|n| self.entries.iter().position(|e| e.name == n))
+            .unwrap_or(0);
+        self.visible_offset = 0;
+        self.sync_offset();
+        true
+    }
+
+    /// Aplica un delta de rueda y devuelve cuántos pasos enteros se
+    /// movieron (positivo = abajo, negativo = arriba). El acumulador
+    /// se ajusta para guardar la fracción residual — útil para
+    /// touchpads que mandan deltas sub-fila.
+    pub fn apply_wheel(&mut self, delta_y: f32) -> i32 {
+        let total = self.wheel_accum + delta_y;
+        let steps = (total / WHEEL_LINES_PER_ROW).trunc() as i32;
+        self.wheel_accum = total - (steps as f32 * WHEEL_LINES_PER_ROW);
+        if steps != 0 {
+            self.scroll(steps);
+        }
+        steps
+    }
+
+    /// Scroll por N pasos enteros (positivo = abajo). No mueve la
+    /// selección.
+    pub fn scroll(&mut self, steps: i32) {
+        if steps == 0 {
+            return;
+        }
+        let len = self.entries.len();
+        let max_offset = len.saturating_sub(self.visible_rows);
+        if steps > 0 {
+            self.visible_offset = min(self.visible_offset + steps as usize, max_offset);
+        } else {
+            let drop = (-steps) as usize;
+            self.visible_offset = self.visible_offset.saturating_sub(drop);
+        }
+    }
+
+    /// Asegura que la selección esté dentro del viewport visible.
+    fn sync_offset(&mut self) {
+        if self.selected < self.visible_offset {
+            self.visible_offset = self.selected;
+        }
+        let bottom = self.visible_offset + self.visible_rows;
+        if self.selected >= bottom {
+            self.visible_offset = self.selected + 1 - self.visible_rows;
+        }
+    }
+}
+
+/// Lee el directorio y devuelve entries ordenadas (dirs primero,
+/// luego por nombre case-insensitive). Si el `read_dir` falla,
+/// devuelve `Vec::new()` (mostrar mensaje queda al caller).
+pub fn scan_dir(path: &Path) -> Vec<Entry> {
+    let Ok(it) = fs::read_dir(path) else {
+        return Vec::new();
+    };
+    let mut entries: Vec<Entry> = it
+        .flatten()
+        .map(|e| {
+            let name = e.file_name().to_string_lossy().to_string();
+            let is_dir = e.file_type().map(|t| t.is_dir()).unwrap_or(false);
+            Entry { name, is_dir }
+        })
+        .collect();
+    entries.sort_by(|a, b| match (a.is_dir, b.is_dir) {
+        (true, false) => std::cmp::Ordering::Less,
+        (false, true) => std::cmp::Ordering::Greater,
+        _ => a.name.to_lowercase().cmp(&b.name.to_lowercase()),
+    });
+    entries
+}
+
+/// Pinta la lista de entries del explorador como `llimphi-widget-list`.
+/// `on_select` recibe el índice de la fila clickeada y devuelve el
+/// Msg que el caller quiera dispatchear (típicamente
+/// `Msg::Select(idx)`).
+pub fn file_explorer_view<Msg, F>(
+    state: &FileExplorerState,
+    palette: ListPalette,
+    on_select: F,
+) -> View<Msg>
+where
+    Msg: Clone + 'static,
+    F: Fn(usize) -> Msg,
+{
+    let start = state.visible_offset;
+    let end = min(state.entries.len(), start + state.visible_rows);
+    let rows: Vec<ListRow<Msg>> = (start..end)
+        .map(|idx| {
+            let entry = &state.entries[idx];
+            let icon = if entry.is_dir { "▸ " } else { "  " };
+            let label = if entry.is_dir {
+                format!("{}{}/", icon, entry.name)
+            } else {
+                format!("{}{}", icon, entry.name)
+            };
+            ListRow {
+                label,
+                selected: idx == state.selected,
+                on_click: on_select(idx),
+            }
+        })
+        .collect();
+
+    let caption = format!(
+        "{} entradas · ↑↓ navega · Enter entra · ⌫ sube",
+        state.entries.len()
+    );
+    let truncated_hint = if state.entries.len() > end {
+        Some(format!(
+            "… y {} más (rueda o ↓ para ver más)",
+            state.entries.len() - end
+        ))
+    } else {
+        None
+    };
+
+    list_view(ListSpec {
+        rows,
+        total: state.entries.len(),
+        caption: Some(caption),
+        truncated_hint,
+        row_height: DEFAULT_ROW_HEIGHT,
+        palette,
+    })
+}
diff --git a/02_ruway/nahual/nahual-font-viewer-llimphi/Cargo.toml b/02_ruway/nahual/nahual-font-viewer-llimphi/Cargo.toml
new file mode 100644
index 0000000..f46c704
--- /dev/null
+++ b/02_ruway/nahual/nahual-font-viewer-llimphi/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "nahual-font-viewer-llimphi"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+authors.workspace = true
+publish.workspace = true
+description = "nahual-font-viewer-llimphi — visor de fuentes TTF/OTF sobre Llimphi. Muestra los metadatos (familia, estilo, glifos, em) y renderiza una muestra DIBUJADA con la propia fuente del archivo, extrayendo los contornos de glifo con ttf-parser. Undécimo visor del shell nahual."
+
+[dependencies]
+llimphi-ui = { workspace = true }
+llimphi-theme = { workspace = true }
+ttf-parser = { workspace = true }
diff --git a/02_ruway/nahual/nahual-font-viewer-llimphi/src/lib.rs b/02_ruway/nahual/nahual-font-viewer-llimphi/src/lib.rs
new file mode 100644
index 0000000..78375b3
--- /dev/null
+++ b/02_ruway/nahual/nahual-font-viewer-llimphi/src/lib.rs
@@ -0,0 +1,399 @@
+//! `nahual-font-viewer-llimphi` — visor de fuentes TTF/OTF.
+//!
+//! Undécimo visor del shell meta-app. Un `.ttf`/`.otf` no lo cubría
+//! ningún visor rico: caía al text viewer como "(binario — sin preview)".
+//! Pero una fuente es para *verla*. Este visor parsea el archivo con
+//! `ttf-parser`, muestra sus metadatos (familia, estilo, nº de glifos,
+//! unidades por em) y —lo interesante— **renderiza una muestra dibujada
+//! con la propia fuente del archivo**: extrae los contornos de cada glifo
+//! a un `kurbo::BezPath` y los rellena en la escena vello vía `paint_with`.
+//!
+//! No pasa por parley (que sólo conoce las fuentes del sistema): los
+//! glifos se pintan directo desde los outlines del archivo, así ves
+//! exactamente la fuente que estás inspeccionando aunque no esté
+//! instalada.
+//!
+//! Patrón fino de los otros viewers: carga sync en [`load_font`], render
+//! en [`font_viewer_view`]. No conoce el AppBus: el caller pasa el path.
+//! MVP feo-primero: muestra fija (pangrama + dígitos), sin elegir tamaño
+//! ni texto todavía.
+
+#![forbid(unsafe_code)]
+
+use std::path::Path;
+
+use llimphi_ui::llimphi_layout::taffy::{
+    prelude::{length, percent, FlexDirection, Size, Style},
+    AlignItems, Rect,
+};
+use llimphi_ui::llimphi_raster::kurbo::{Affine, BezPath};
+use llimphi_ui::llimphi_raster::peniko::{Color, Fill};
+use llimphi_ui::llimphi_text::Alignment;
+use llimphi_ui::View;
+
+/// Tope de bytes a leer (32 MiB). Una fuente más grande es rara; el
+/// caller puede subirlo.
+pub const DEFAULT_FONT_BYTES_MAX: u64 = 32 * 1024 * 1024;
+
+/// Líneas de muestra que se renderizan con la fuente del archivo.
+const SAMPLE_LINES: &[&str] = &[
+    "Aa Bb Cc Dd Ee Ff Gg",
+    "The quick brown fox jumps",
+    "0123456789  !?.,;:&@#",
+];
+
+/// Una línea de muestra ya convertida a contornos, en unidades de fuente
+/// (eje Y hacia arriba, origen en la baseline). El render la escala.
+#[derive(Debug, Clone, PartialEq)]
+pub struct SampleLine {
+    pub path: BezPath,
+    /// Ancho total avanzado, en unidades de fuente.
+    pub width: f64,
+}
+
+/// Metadatos + muestras renderizables de una fuente abierta.
+#[derive(Debug, Clone, PartialEq)]
+pub struct FontInfo {
+    pub family: String,
+    pub subfamily: String,
+    pub num_glyphs: u16,
+    pub units_per_em: u16,
+    pub ascender: i16,
+    pub descender: i16,
+    pub lines: Vec<SampleLine>,
+}
+
+/// Estado del visor. Replica la forma de los otros.
+#[derive(Debug, Clone, Default, PartialEq)]
+pub enum FontPreview {
+    /// Sin archivo seleccionado.
+    #[default]
+    Empty,
+    /// Fuente parseada.
+    Font(Box<FontInfo>),
+    /// Excede el tope de tamaño.
+    TooBig(u64),
+    /// No se pudo abrir/parsear.
+    Error(String),
+}
+
+/// Implementa el sink de `ttf-parser` para volcar el contorno de un glifo
+/// a un `kurbo::BezPath`.
+struct OutlineToPath {
+    path: BezPath,
+}
+
+impl ttf_parser::OutlineBuilder for OutlineToPath {
+    fn move_to(&mut self, x: f32, y: f32) {
+        self.path.move_to((x as f64, y as f64));
+    }
+    fn line_to(&mut self, x: f32, y: f32) {
+        self.path.line_to((x as f64, y as f64));
+    }
+    fn quad_to(&mut self, x1: f32, y1: f32, x: f32, y: f32) {
+        self.path.quad_to((x1 as f64, y1 as f64), (x as f64, y as f64));
+    }
+    fn curve_to(&mut self, x1: f32, y1: f32, x2: f32, y2: f32, x: f32, y: f32) {
+        self.path
+            .curve_to((x1 as f64, y1 as f64), (x2 as f64, y2 as f64), (x as f64, y as f64));
+    }
+    fn close(&mut self) {
+        self.path.close_path();
+    }
+}
+
+/// Lee y parsea la fuente, construyendo las muestras de contorno.
+pub fn load_font(path: &Path, max_bytes: u64) -> FontPreview {
+    match std::fs::metadata(path) {
+        Ok(meta) if meta.len() > max_bytes => return FontPreview::TooBig(meta.len()),
+        Err(e) => return FontPreview::Error(e.to_string()),
+        _ => {}
+    }
+    let bytes = match std::fs::read(path) {
+        Ok(b) => b,
+        Err(e) => return FontPreview::Error(e.to_string()),
+    };
+    let face = match ttf_parser::Face::parse(&bytes, 0) {
+        Ok(f) => f,
+        Err(e) => return FontPreview::Error(format!("no parsea como fuente: {e}")),
+    };
+    FontPreview::Font(Box::new(build_info(&face)))
+}
+
+/// Extrae metadatos y arma las líneas de muestra a partir de una `Face`.
+fn build_info(face: &ttf_parser::Face<'_>) -> FontInfo {
+    let family = pick_name(face, 1).unwrap_or_else(|| "(sin nombre)".to_string());
+    let subfamily = pick_name(face, 2).unwrap_or_else(|| "Regular".to_string());
+    let em = face.units_per_em();
+    let lines = SAMPLE_LINES
+        .iter()
+        .map(|s| build_line(face, s))
+        .collect();
+    FontInfo {
+        family,
+        subfamily,
+        num_glyphs: face.number_of_glyphs(),
+        units_per_em: em,
+        ascender: face.ascender(),
+        descender: face.descender(),
+        lines,
+    }
+}
+
+/// Toma el primer `name` legible con el `name_id` pedido (1=familia,
+/// 2=subfamilia). `ttf-parser` sólo devuelve string para encodings
+/// Unicode/Mac, así que algunos nombres salen `None`.
+fn pick_name(face: &ttf_parser::Face<'_>, want_id: u16) -> Option<String> {
+    face.names()
+        .into_iter()
+        .filter(|n| n.name_id == want_id)
+        .find_map(|n| n.to_string())
+        .filter(|s| !s.is_empty())
+}
+
+/// Convierte una cadena en un único `BezPath` (todos los glifos
+/// trasladados a su posición de pen) en unidades de fuente.
+fn build_line(face: &ttf_parser::Face<'_>, text: &str) -> SampleLine {
+    let mut combined = BezPath::new();
+    let mut pen: f64 = 0.0;
+    let space = face.units_per_em() as f64 / 3.0;
+    for ch in text.chars() {
+        let gid = match face.glyph_index(ch) {
+            Some(g) => g,
+            None => {
+                pen += space;
+                continue;
+            }
+        };
+        let mut sink = OutlineToPath { path: BezPath::new() };
+        if face.outline_glyph(gid, &mut sink).is_some() {
+            sink.path.apply_affine(Affine::translate((pen, 0.0)));
+            combined.extend(sink.path.elements().iter().copied());
+        }
+        let adv = face.glyph_hor_advance(gid).unwrap_or(0) as f64;
+        // Un avance 0 (p.ej. espacio sin glifo) usa el ancho de fallback.
+        pen += if adv > 0.0 { adv } else { space };
+    }
+    SampleLine { path: combined, width: pen }
+}
+
+/// Paleta del viewer.
+#[derive(Debug, Clone, Copy)]
+pub struct FontViewerPalette {
+    pub bg: Color,
+    pub fg_text: Color,
+    pub fg_muted: Color,
+    pub fg_error: Color,
+    pub glyph: Color,
+}
+
+impl Default for FontViewerPalette {
+    fn default() -> Self {
+        Self::from_theme(&llimphi_theme::Theme::dark())
+    }
+}
+
+impl FontViewerPalette {
+    pub fn from_theme(t: &llimphi_theme::Theme) -> Self {
+        Self {
+            bg: t.bg_app,
+            fg_text: t.fg_text,
+            fg_muted: t.fg_muted,
+            fg_error: t.fg_destructive,
+            glyph: t.fg_text,
+        }
+    }
+}
+
+/// Pinta header + metadatos + lienzo con la muestra dibujada.
+pub fn font_viewer_view<Msg>(
+    state: &FontPreview,
+    path: Option<&Path>,
+    palette: &FontViewerPalette,
+) -> View<Msg>
+where
+    Msg: Clone + 'static,
+{
+    let header_text = match path {
+        Some(p) => format!(
+            "font · {}",
+            p.file_name()
+                .map(|s| s.to_string_lossy().to_string())
+                .unwrap_or_else(|| p.display().to_string())
+        ),
+        None => "(seleccioná una fuente TTF/OTF)".to_string(),
+    };
+
+    let header = View::new(Style {
+        size: Size {
+            width: percent(1.0_f32),
+            height: length(20.0_f32),
+        },
+        padding: pad(12.0, 0.0),
+        align_items: Some(AlignItems::Center),
+        ..Default::default()
+    })
+    .text_aligned(header_text, 10.0, palette.fg_muted, Alignment::Start);
+
+    let children = match state {
+        FontPreview::Empty => vec![header, info_line("—", palette.fg_muted)],
+        FontPreview::TooBig(n) => vec![
+            header,
+            info_line(&format!("(fuente muy grande: {n} bytes)"), palette.fg_muted),
+        ],
+        FontPreview::Error(e) => {
+            vec![header, info_line(&format!("(no se pudo abrir: {e})"), palette.fg_error)]
+        }
+        FontPreview::Font(info) => {
+            let meta = format!(
+                "{} · {}\n{} glifos · {} u/em · asc {} / desc {}",
+                info.family,
+                info.subfamily,
+                info.num_glyphs,
+                info.units_per_em,
+                info.ascender,
+                info.descender,
+            );
+            vec![
+                header,
+                info_line(&meta, palette.fg_text),
+                sample_canvas::<Msg>(info, palette),
+            ]
+        }
+    };
+
+    View::new(Style {
+        flex_direction: FlexDirection::Column,
+        flex_grow: 1.0,
+        size: Size {
+            width: percent(1.0_f32),
+            height: percent(1.0_f32),
+        },
+        padding: Rect {
+            left: length(0.0_f32),
+            right: length(0.0_f32),
+            top: length(6.0_f32),
+            bottom: length(0.0_f32),
+        },
+        ..Default::default()
+    })
+    .fill(palette.bg)
+    .clip(true)
+    .children(children)
+}
+
+/// Lienzo que dibuja las líneas de muestra rellenando los contornos de
+/// glifo. Los paths vienen en unidades de fuente; acá los escalamos para
+/// que entren a lo ancho y los apilamos verticalmente.
+fn sample_canvas<Msg>(info: &FontInfo, palette: &FontViewerPalette) -> View<Msg>
+where
+    Msg: Clone + 'static,
+{
+    let lines = info.lines.clone();
+    let em = info.units_per_em.max(1) as f64;
+    let ascender = info.ascender as f64;
+    let descender = info.descender as f64;
+    let glyph_color = palette.glyph;
+
+    View::new(Style {
+        flex_grow: 1.0,
+        size: Size {
+            width: percent(1.0_f32),
+            height: percent(1.0_f32),
+        },
+        padding: pad(16.0, 10.0),
+        ..Default::default()
+    })
+    .paint_with(move |scene, _ts, rect| {
+        if rect.w <= 8.0 || rect.h <= 8.0 || lines.is_empty() {
+            return;
+        }
+        let pad_x = 4.0_f64;
+        let avail_w = (rect.w as f64 - 2.0 * pad_x).max(1.0);
+        // Altura de cada renglón = alto del lienzo repartido (con tope para
+        // que un panel alto no infle los glifos hasta deformarlos).
+        let slot_h = ((rect.h as f64) / lines.len() as f64).min(96.0);
+        // El glifo ocupa la caja ascender..descender → escala por alto.
+        let line_units = (ascender - descender).max(em);
+        for (i, line) in lines.iter().enumerate() {
+            if line.path.elements().is_empty() {
+                continue;
+            }
+            // Escala que respeta tanto el alto del renglón como el ancho.
+            let scale_h = (slot_h * 0.72) / line_units;
+            let scale_w = if line.width > 0.0 {
+                avail_w / line.width
+            } else {
+                scale_h
+            };
+            let scale = scale_h.min(scale_w);
+            let baseline = rect.y as f64 + i as f64 * slot_h + slot_h * 0.5 + (ascender * scale) * 0.5;
+            let x0 = rect.x as f64 + pad_x;
+            // Font: Y arriba; pantalla: Y abajo → escala Y negativa.
+            let affine = Affine::new([scale, 0.0, 0.0, -scale, x0, baseline]);
+            scene.fill(Fill::NonZero, affine, glyph_color, None, &line.path);
+        }
+    })
+}
+
+/// Bloque de texto de una línea (metadatos / estados).
+fn info_line<Msg>(text: &str, color: Color) -> View<Msg>
+where
+    Msg: Clone + 'static,
+{
+    View::new(Style {
+        size: Size {
+            width: percent(1.0_f32),
+            height: length(40.0_f32),
+        },
+        padding: pad(12.0, 4.0),
+        ..Default::default()
+    })
+    .text_aligned(text.to_string(), 12.0, color, Alignment::Start)
+}
+
+/// Padding horizontal `h` + vertical `v`.
+fn pad(h: f32, v: f32) -> Rect<llimphi_ui::llimphi_layout::taffy::LengthPercentage> {
+    Rect {
+        left: length(h),
+        right: length(h),
+        top: length(v),
+        bottom: length(v),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn inexistente_es_error() {
+        assert!(matches!(
+            load_font(Path::new("/no/existe.ttf"), DEFAULT_FONT_BYTES_MAX),
+            FontPreview::Error(_)
+        ));
+    }
+
+    #[test]
+    fn basura_no_es_fuente() {
+        let tmp = std::env::temp_dir().join("nahual-font-viewer-test-bad.ttf");
+        std::fs::write(&tmp, b"no soy una fuente, soy texto cualquiera").unwrap();
+        assert!(matches!(
+            load_font(&tmp, DEFAULT_FONT_BYTES_MAX),
+            FontPreview::Error(_)
+        ));
+        let _ = std::fs::remove_file(&tmp);
+    }
+
+    #[test]
+    fn outline_builder_construye_path() {
+        // Verifica que el sink traduce los comandos a elementos de BezPath.
+        let mut sink = OutlineToPath { path: BezPath::new() };
+        use ttf_parser::OutlineBuilder;
+        sink.move_to(0.0, 0.0);
+        sink.line_to(10.0, 0.0);
+        sink.quad_to(10.0, 10.0, 0.0, 10.0);
+        sink.close();
+        assert_eq!(sink.path.elements().len(), 4);
+    }
+}
diff --git a/02_ruway/nahual/nahual-gallery-llimphi/Cargo.toml b/02_ruway/nahual/nahual-gallery-llimphi/Cargo.toml
new file mode 100644
index 0000000..0009a66
--- /dev/null
+++ b/02_ruway/nahual/nahual-gallery-llimphi/Cargo.toml
@@ -0,0 +1,23 @@
+[package]
+name = "nahual-gallery-llimphi"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+authors.workspace = true
+publish.workspace = true
+description = "nahual-gallery-llimphi — galería de miniaturas tipo gThumb/FastStone sobre Llimphi. Cose llimphi-widget-grid (virtualización 2D) + nahual-thumb-core (generación + cache + planificador): lista miles de imágenes de una carpeta, decodifica en background con Handle::spawn priorizado al viewport, y pinta sólo la ventana visible."
+
+[[bin]]
+name = "nahual-gallery"
+path = "src/main.rs"
+
+[dependencies]
+llimphi-ui = { workspace = true }
+llimphi-theme = { workspace = true }
+llimphi-widget-grid = { workspace = true }
+llimphi-widget-breadcrumb = { workspace = true }
+nahual-thumb-core = { workspace = true }
+nahual-image-viewer-llimphi = { workspace = true }
+llimphi-widget-menubar = { workspace = true }
+llimphi-widget-context-menu = { workspace = true }
+app-bus = { workspace = true }
diff --git a/02_ruway/nahual/nahual-gallery-llimphi/src/main.rs b/02_ruway/nahual/nahual-gallery-llimphi/src/main.rs
new file mode 100644
index 0000000..ff8d5e9
--- /dev/null
+++ b/02_ruway/nahual/nahual-gallery-llimphi/src/main.rs
@@ -0,0 +1,1025 @@
+//! `nahual-gallery-llimphi` — galería de miniaturas tipo gThumb / FastStone.
+//!
+//! Cose las dos piezas del pipeline de galería:
+//! - [`llimphi_widget_grid`] → virtualización 2D (sólo monta la ventana
+//!   visible, aunque la carpeta tenga miles de imágenes).
+//! - [`nahual_thumb_core`] → genera las miniaturas (decode + downscale),
+//!   las cachea en RAM y planifica la cola priorizada al viewport.
+//!
+//! La concurrencia la pone `Handle::spawn`: por cada path que el
+//! planificador entrega, lanzamos un thread que decodifica y reentra con
+//! `Msg::ThumbListo`. Mientras tanto la celda muestra un placeholder.
+//!
+//! Navegación: la grilla mezcla subcarpetas (ícono 📁, primero) e
+//! imágenes. Un clic en carpeta entra; en imagen selecciona (⏎/espacio
+//! abre el preview). `⌫` sube al padre y el breadcrumb salta a cualquier
+//! ancestro. `o` cicla el orden de las imágenes (nombre/tamaño/fecha).
+//!
+//! Uso: `cargo run -p nahual-gallery-llimphi --release -- <carpeta>`
+//! (sin argumento usa el directorio actual).
+//!
+//! Limitación MVP: el tamaño del viewport se asume fijo (= `initial_size`)
+//! porque el trait `App` de Llimphi todavía no expone un hook de resize —
+//! mismo atajo que `nahual-file-explorer`. Al achicar/agrandar la ventana
+//! las columnas no se recalculan hasta que eso exista.
+
+use std::collections::{HashMap, HashSet};
+use std::path::{Path, PathBuf};
+use std::sync::Arc;
+use std::time::Duration;
+
+use llimphi_theme::Theme;
+use llimphi_ui::llimphi_layout::taffy::{
+    prelude::{length, percent, FlexDirection, Size, Style},
+    AlignItems, JustifyContent, Rect,
+};
+use llimphi_ui::llimphi_raster::peniko::{Blob, Image, ImageFormat};
+use llimphi_ui::llimphi_text::Alignment;
+use llimphi_ui::{App, Handle, Key, KeyEvent, KeyState, Modifiers, NamedKey, View, WheelDelta};
+use llimphi_widget_breadcrumb::{breadcrumb_view, BreadcrumbPalette};
+use llimphi_widget_grid::{grid_view, ventana_visible, GridCell, GridMetrics, GridPalette};
+use nahual_image_viewer_llimphi::{
+    image_viewer_view, load_image, ImagePreviewState, ImageViewerPalette,
+};
+use nahual_thumb_core::{
+    generar_thumb_de_archivo, obtener_o_generar, CacheDisco, Planificador, ThumbRgba,
+};
+use llimphi_widget_context_menu::{
+    context_menu_view, ContextMenuItem, ContextMenuPalette, ContextMenuSpec,
+};
+use llimphi_widget_menubar::{
+    menubar_overlay, menubar_view, MenuBarSpec, DEFAULT_HEIGHT as MENU_H,
+};
+use app_bus::{AppMenu, Menu, MenuItem};
+
+/// Lado máximo de la miniatura generada (px). Un poco mayor que el tile
+/// para que se vea nítida; el grid la reduce al pintar.
+const THUMB_LADO: u32 = 224;
+/// Cuántas decodificaciones concurrentes permitir (~núcleos).
+const MAX_EN_VUELO: usize = 6;
+/// Alto reservado para el header en px (descontado del viewport útil).
+const HEADER_H: f32 = 44.0;
+/// Alto de la barra de breadcrumb (ruta navegable).
+const BREADCRUMB_H: f32 = 30.0;
+
+/// Una entrada de la carpeta actual: subcarpeta navegable o archivo de
+/// imagen con miniatura (y su tamaño en disco, para el badge). Las carpetas
+/// se listan primero.
+#[derive(Clone)]
+enum Entrada {
+    Carpeta(PathBuf),
+    Imagen { path: PathBuf, size: u64 },
+}
+
+impl Entrada {
+    fn path(&self) -> &Path {
+        match self {
+            Entrada::Carpeta(p) => p,
+            Entrada::Imagen { path, .. } => path,
+        }
+    }
+    fn es_carpeta(&self) -> bool {
+        matches!(self, Entrada::Carpeta(_))
+    }
+}
+
+/// Formatea un tamaño en bytes de forma humana (B/KB/MB/GB).
+fn humano(n: u64) -> String {
+    const U: [&str; 4] = ["B", "KB", "MB", "GB"];
+    let mut v = n as f64;
+    let mut i = 0;
+    while v >= 1024.0 && i < 3 {
+        v /= 1024.0;
+        i += 1;
+    }
+    if i == 0 {
+        format!("{n} B")
+    } else {
+        format!("{v:.1} {}", U[i])
+    }
+}
+
+/// Extensiones que tratamos como imagen (alineadas con las features del
+/// crate `image` en el workspace: png/jpeg/webp).
+const EXTS: &[&str] = &["png", "jpg", "jpeg", "webp"];
+/// Tope para abrir una imagen a tamaño completo en el preview (64 MB de
+/// archivo — un PNG/JPEG así decodifica a cientos de MB, pero es el límite
+/// del visor existente).
+const MAX_PREVIEW_BYTES: u64 = 64 * 1024 * 1024;
+/// Tope de miniaturas en RAM. Al pasarlo, se descartan las más lejanas a la
+/// ventana visible (con margen) — acota la memoria en carpetas enormes.
+const CAP_THUMBS: usize = 800;
+/// Rango de tile permitido al hacer zoom con +/−.
+const TILE_MIN: f32 = 80.0;
+const TILE_MAX: f32 = 280.0;
+/// Alto del label bajo la miniatura (nombre + tamaño).
+const LABEL_H: f32 = 20.0;
+/// Intervalo del slideshow.
+const SLIDE_SECS: u64 = 3;
+
+/// Criterio de orden de la grilla.
+#[derive(Clone, Copy, PartialEq, Eq)]
+enum Orden {
+    Nombre,
+    Tamano,
+    Fecha,
+}
+
+impl Orden {
+    fn siguiente(self) -> Self {
+        match self {
+            Orden::Nombre => Orden::Tamano,
+            Orden::Tamano => Orden::Fecha,
+            Orden::Fecha => Orden::Nombre,
+        }
+    }
+    fn etiqueta(self) -> &'static str {
+        match self {
+            Orden::Nombre => "nombre",
+            Orden::Tamano => "tamaño",
+            Orden::Fecha => "fecha",
+        }
+    }
+}
+
+#[derive(Clone)]
+enum Msg {
+    /// Desplaza la grilla por N filas (positivo = hacia abajo).
+    Scroll(i32),
+    /// Marca una celda como seleccionada.
+    Seleccionar(usize),
+    /// Miniatura lista (llega desde el thread de decodificación).
+    ThumbListo(PathBuf, ThumbRgba),
+    /// Falló la generación de una miniatura.
+    ThumbFallo(PathBuf, String),
+    /// Tecla (navegación con flechas / página).
+    Tecla(KeyEvent),
+    /// Abre la imagen `i` a tamaño completo (overlay de preview).
+    AbrirPreview(usize),
+    /// Imagen del preview cargada (llega desde el thread de carga).
+    PreviewListo(PathBuf, ImagePreviewState),
+    /// Mueve el preview a la imagen vecina (±1) y la carga.
+    PreviewVecino(i32),
+    /// Cierra el overlay de preview.
+    CerrarPreview,
+    /// Cambia el criterio de orden de la grilla.
+    CiclarOrden,
+    /// Activa la entrada `i`: entra a la carpeta o abre el preview.
+    Activar(usize),
+    /// Sube a la carpeta padre.
+    Subir,
+    /// Navega al segmento `i` del breadcrumb (raíz → hoja).
+    NavegarSegmento(usize),
+    /// Ajusta el tamaño del tile (zoom de grilla) por el delta dado en px.
+    Zoom(f32),
+    /// Alterna el slideshow (sólo con el preview abierto).
+    ToggleSlideshow,
+    /// Tick del slideshow: avanza a la imagen siguiente.
+    SlideAvanzar,
+    /// Abre/cierra un menú raíz de la barra (índice del menú).
+    MenuOpen(Option<usize>),
+    /// Comando del menú principal (command id → acción real).
+    MenuCommand(String),
+    /// Cierra todo overlay de menú (raíz y contextual).
+    CloseMenus,
+    /// Abre el menú contextual en coords de ventana, sobre la selección.
+    ContextMenuOpen(f32, f32),
+    /// Cicla la paleta de tema.
+    CiclarTema,
+}
+
+struct Model {
+    dir: PathBuf,
+    entries: Vec<Entrada>,
+    scroll_fila: usize,
+    seleccionado: Option<usize>,
+    /// Miniaturas ya listas para pintar (peniko). Es el cache RAM del lado
+    /// de la app; el cache atado a mtime de `nahual-thumb-core` se enchufa
+    /// en el paso 3 (disco).
+    thumbs: HashMap<PathBuf, Image>,
+    /// Paths cuya generación falló — pintan un ⚠ en vez de reintentar.
+    fallidos: HashSet<PathBuf>,
+    plan: Planificador,
+    /// Cache en disco de miniaturas (reabrir sin re-decodificar). `None`
+    /// si no se pudo crear la carpeta — se cae a generar en RAM siempre.
+    cache_disco: Option<CacheDisco>,
+    metrics: GridMetrics,
+    /// Viewport útil asumido (de `initial_size`, menos el header).
+    vw: f32,
+    vh: f32,
+    /// Imagen abierta a tamaño completo (overlay). `None` = grilla normal.
+    preview: Option<(PathBuf, ImagePreviewState)>,
+    /// Slideshow activo (avanza solo en el preview).
+    slideshow: bool,
+    orden: Orden,
+    estado: String,
+    theme: Theme,
+    /// Menú raíz abierto en la barra (índice), si lo hay.
+    menu_open: Option<usize>,
+    /// Menú contextual abierto en (x, y) de ventana, si lo hay.
+    context_menu: Option<(f32, f32)>,
+}
+
+struct Gallery;
+
+impl App for Gallery {
+    type Model = Model;
+    type Msg = Msg;
+
+    fn title() -> &'static str {
+        "nahual · galería"
+    }
+
+    fn initial_size() -> (u32, u32) {
+        (1180, 760)
+    }
+
+    fn init(handle: &Handle<Msg>) -> Model {
+        let dir = std::env::args()
+            .nth(1)
+            .map(PathBuf::from)
+            .unwrap_or_else(|| std::env::current_dir().unwrap_or_else(|_| PathBuf::from(".")));
+        let orden = Orden::Nombre;
+        let entries = listar(&dir, orden);
+        let (w, h) = Self::initial_size();
+        let metrics = GridMetrics {
+            tile_w: 140.0,
+            tile_h: 140.0 + LABEL_H,
+            gap: 10.0,
+            pad: 12.0,
+        };
+        let estado = format!("{} ítems", entries.len());
+        let mut m = Model {
+            dir,
+            entries,
+            scroll_fila: 0,
+            seleccionado: None,
+            thumbs: HashMap::new(),
+            fallidos: HashSet::new(),
+            plan: Planificador::nuevo(MAX_EN_VUELO),
+            cache_disco: CacheDisco::por_defecto().ok(),
+            metrics,
+            vw: w as f32,
+            vh: h as f32 - MENU_H - HEADER_H - BREADCRUMB_H,
+            preview: None,
+            slideshow: false,
+            orden,
+            estado,
+            theme: Theme::dark(),
+            menu_open: None,
+            context_menu: None,
+        };
+        bombear(&mut m, handle);
+        m
+    }
+
+    fn on_wheel(_: &Model, delta: WheelDelta, _: (f32, f32), _: Modifiers) -> Option<Msg> {
+        // delta.y positivo = rueda hacia arriba ⇒ scroll hacia arriba
+        // (filas menores). Convertimos a pasos enteros de fila.
+        let pasos = -delta.y.round() as i32;
+        if pasos == 0 {
+            None
+        } else {
+            Some(Msg::Scroll(pasos))
+        }
+    }
+
+    fn on_key(model: &Model, e: &KeyEvent) -> Option<Msg> {
+        if e.state != KeyState::Pressed {
+            return None;
+        }
+        // Con el preview abierto, las teclas controlan el preview, no la
+        // grilla: Esc cierra, ←/→ saltan a la vecina.
+        if model.preview.is_some() {
+            return match &e.key {
+                Key::Named(NamedKey::Escape) => Some(Msg::CerrarPreview),
+                Key::Named(NamedKey::ArrowRight) => Some(Msg::PreviewVecino(1)),
+                Key::Named(NamedKey::ArrowLeft) => Some(Msg::PreviewVecino(-1)),
+                Key::Character(c) if c == "s" => Some(Msg::ToggleSlideshow),
+                _ => None,
+            };
+        }
+        // Enter / Espacio activan la entrada seleccionada (entrar a la
+        // carpeta o abrir el preview); Backspace sube a la carpeta padre.
+        match &e.key {
+            Key::Named(NamedKey::Enter) | Key::Named(NamedKey::Space) => {
+                model.seleccionado.map(Msg::Activar)
+            }
+            Key::Named(NamedKey::Backspace) => Some(Msg::Subir),
+            Key::Character(c) if c == "o" => Some(Msg::CiclarOrden),
+            // Zoom de grilla: + / = agrandan, - achica.
+            Key::Character(c) if c == "+" || c == "=" => Some(Msg::Zoom(20.0)),
+            Key::Character(c) if c == "-" => Some(Msg::Zoom(-20.0)),
+            _ => Some(Msg::Tecla(e.clone())),
+        }
+    }
+
+    fn update(model: Model, msg: Msg, handle: &Handle<Msg>) -> Model {
+        let mut m = model;
+        match msg {
+            Msg::Scroll(pasos) => {
+                let nueva = (m.scroll_fila as i32 + pasos).max(0) as usize;
+                m.scroll_fila = nueva;
+                bombear(&mut m, handle);
+            }
+            Msg::Seleccionar(i) => {
+                if i < m.entries.len() {
+                    m.seleccionado = Some(i);
+                    m.estado = nombre(m.entries[i].path());
+                }
+            }
+            Msg::ThumbListo(path, t) => {
+                m.plan.completar(&path);
+                let img = Image::new(Blob::from(t.rgba), ImageFormat::Rgba8, t.w, t.h);
+                m.thumbs.insert(path, img);
+                // Encadenar: liberado un cupo, pedir el próximo lote.
+                bombear(&mut m, handle);
+            }
+            Msg::ThumbFallo(path, e) => {
+                m.plan.completar(&path);
+                m.estado = format!("falló {}: {e}", nombre(&path));
+                m.fallidos.insert(path);
+                bombear(&mut m, handle);
+            }
+            Msg::Tecla(ev) => {
+                manejar_tecla(&mut m, &ev, handle);
+            }
+            Msg::AbrirPreview(i) => {
+                abrir_preview(&mut m, i, handle);
+            }
+            Msg::PreviewListo(path, st) => {
+                // Sólo aplicar si seguimos viendo la misma imagen (evita que
+                // una carga lenta pise a otra más nueva).
+                if let Some((actual, _)) = &m.preview {
+                    if actual == &path {
+                        m.estado = nombre(&path);
+                        m.preview = Some((path, st));
+                    }
+                }
+            }
+            Msg::PreviewVecino(d) => {
+                avanzar_imagen(&mut m, d, false, handle);
+            }
+            Msg::CerrarPreview => {
+                m.preview = None;
+                m.slideshow = false;
+            }
+            Msg::Zoom(d) => {
+                let w = (m.metrics.tile_w + d).clamp(TILE_MIN, TILE_MAX);
+                m.metrics.tile_w = w;
+                m.metrics.tile_h = w + LABEL_H;
+                m.estado = format!("tile {:.0}px", w);
+                bombear(&mut m, handle);
+            }
+            Msg::ToggleSlideshow => {
+                if m.preview.is_some() {
+                    m.slideshow = !m.slideshow;
+                    m.estado = if m.slideshow {
+                        "slideshow ▶".into()
+                    } else {
+                        "slideshow ⏸".into()
+                    };
+                    if m.slideshow {
+                        programar_slide(handle);
+                    }
+                }
+            }
+            Msg::SlideAvanzar => {
+                // Sólo avanza si el slideshow sigue activo y hay preview.
+                if m.slideshow && m.preview.is_some() {
+                    avanzar_imagen(&mut m, 1, true, handle);
+                    programar_slide(handle);
+                }
+            }
+            Msg::CiclarOrden => {
+                // Conservar la selección por path al re-listar (que reordena).
+                let sel_path = m.seleccionado.and_then(|i| m.entries.get(i).map(|e| e.path().to_path_buf()));
+                m.orden = m.orden.siguiente();
+                m.entries = listar(&m.dir, m.orden);
+                m.seleccionado =
+                    sel_path.and_then(|p| m.entries.iter().position(|e| e.path() == p));
+                m.estado = format!("orden: {}", m.orden.etiqueta());
+                bombear(&mut m, handle);
+            }
+            Msg::Activar(i) => {
+                if let Some(e) = m.entries.get(i) {
+                    if e.es_carpeta() {
+                        let dir = e.path().to_path_buf();
+                        navegar_a(&mut m, dir, handle);
+                    } else {
+                        abrir_preview(&mut m, i, handle);
+                    }
+                }
+            }
+            Msg::Subir => {
+                if let Some(padre) = m.dir.parent().map(|p| p.to_path_buf()) {
+                    navegar_a(&mut m, padre, handle);
+                }
+            }
+            Msg::NavegarSegmento(i) => {
+                if let Some(dir) = ancestros(&m.dir).get(i).cloned() {
+                    navegar_a(&mut m, dir, handle);
+                }
+            }
+            Msg::MenuOpen(which) => {
+                m.menu_open = which;
+                m.context_menu = None;
+            }
+            Msg::MenuCommand(cmd) => {
+                m.menu_open = None;
+                return handle_menu_command(m, &cmd, handle);
+            }
+            Msg::CloseMenus => {
+                m.menu_open = None;
+                m.context_menu = None;
+            }
+            Msg::ContextMenuOpen(x, y) => {
+                m.menu_open = None;
+                m.context_menu = Some((x, y));
+            }
+            Msg::CiclarTema => {
+                m.theme = Theme::next_after(m.theme.name);
+            }
+        }
+        m
+    }
+
+    fn view_overlay(model: &Model) -> Option<View<Msg>> {
+        // El preview a pantalla completa manda mientras esté abierto.
+        if let Some((path, st)) = model.preview.as_ref() {
+            let pal = ImageViewerPalette::from_theme(&model.theme);
+            let viewer = image_viewer_view::<Msg>(st, Some(path), &pal);
+            // Scrim a pantalla completa: cubre la grilla y, al clickear (fuera o
+            // sobre la imagen), cierra el preview. Esc y ←/→ los maneja on_key.
+            return Some(
+                View::new(Style {
+                    size: Size {
+                        width: percent(1.0_f32),
+                        height: percent(1.0_f32),
+                    },
+                    ..Default::default()
+                })
+                .fill(model.theme.bg_app)
+                .on_click(Msg::CerrarPreview)
+                .children(vec![viewer]),
+            );
+        }
+
+        // Menú contextual sobre la entrada seleccionada: prioridad sobre el
+        // dropdown del menú principal.
+        if let Some((x, y)) = model.context_menu {
+            let sel = model.seleccionado.and_then(|i| model.entries.get(i));
+            let header = sel
+                .map(|e| nombre(e.path()))
+                .unwrap_or_else(|| "galería".to_string());
+            let es_carpeta = sel.map(|e| e.es_carpeta()).unwrap_or(false);
+            // Acciones reales según la entrada: carpeta ⇒ entrar; imagen ⇒
+            // abrir preview. Más reset de zoom / ciclar orden, siempre útiles.
+            let items = if es_carpeta {
+                vec![
+                    ContextMenuItem::action("Entrar a la carpeta"),
+                    ContextMenuItem::action("Reiniciar zoom"),
+                    ContextMenuItem::action("Ciclar orden"),
+                ]
+            } else if sel.is_some() {
+                vec![
+                    ContextMenuItem::action("Abrir imagen"),
+                    ContextMenuItem::action("Reiniciar zoom"),
+                    ContextMenuItem::action("Ciclar orden"),
+                ]
+            } else {
+                vec![
+                    ContextMenuItem::action("Reiniciar zoom"),
+                    ContextMenuItem::action("Ciclar orden"),
+                ]
+            };
+            let idx = model.seleccionado;
+            let tile_w = model.metrics.tile_w;
+            let tiene_sel = sel.is_some();
+            let on_pick: Arc<dyn Fn(usize) -> Msg + Send + Sync> =
+                Arc::new(move |i: usize| {
+                    if tiene_sel {
+                        match i {
+                            0 => idx.map(Msg::Activar).unwrap_or(Msg::CloseMenus),
+                            1 => Msg::Zoom(140.0 - tile_w),
+                            _ => Msg::CiclarOrden,
+                        }
+                    } else {
+                        match i {
+                            0 => Msg::Zoom(140.0 - tile_w),
+                            _ => Msg::CiclarOrden,
+                        }
+                    }
+                });
+            return Some(context_menu_view(ContextMenuSpec {
+                anchor: (x, y),
+                viewport: viewport_of(model),
+                header: Some(header),
+                items,
+                active: usize::MAX,
+                on_pick,
+                on_dismiss: Msg::CloseMenus,
+                palette: ContextMenuPalette::from_theme(&model.theme),
+            }));
+        }
+
+        // Si no, el dropdown del menú principal.
+        let menu = app_menu();
+        menubar_overlay(&menubar_spec(&menu, model, &model.theme))
+    }
+
+    fn view(model: &Model) -> View<Msg> {
+        let theme = model.theme;
+        let v = ventana_visible(
+            model.entries.len(),
+            model.vw,
+            model.vh,
+            model.scroll_fila,
+            &model.metrics,
+        );
+
+        let menu = app_menu();
+        let menubar = menubar_view(&menubar_spec(&menu, model, &theme));
+        let header = encabezado(model, &v);
+        let ruta = barra_ruta(model);
+
+        let cuerpo: View<Msg> = if model.entries.is_empty() {
+            View::new(Style {
+                size: Size {
+                    width: percent(1.0_f32),
+                    height: percent(1.0_f32),
+                },
+                align_items: Some(AlignItems::Center),
+                justify_content: Some(JustifyContent::Center),
+                ..Default::default()
+            })
+            .fill(theme.bg_panel)
+            .text(
+                format!("sin imágenes ni subcarpetas en {}", model.dir.display()),
+                14.0,
+                theme.fg_muted,
+            )
+        } else {
+            let cells: Vec<GridCell<Msg>> = (v.first..v.first + v.count)
+                .map(|i| {
+                    let e = &model.entries[i];
+                    let label = match e {
+                        Entrada::Imagen { path, size } => {
+                            format!("{}  ·  {}", nombre(path), humano(*size))
+                        }
+                        Entrada::Carpeta(p) => nombre(p),
+                    };
+                    GridCell {
+                        content: celda_contenido(model, e),
+                        label: Some(label),
+                        selected: model.seleccionado == Some(i),
+                        // Un clic en carpeta entra; en imagen selecciona
+                        // (⏎/espacio la abre en preview).
+                        on_click: if e.es_carpeta() {
+                            Msg::Activar(i)
+                        } else {
+                            Msg::Seleccionar(i)
+                        },
+                    }
+                })
+                .collect();
+            let mostrados = v.first + v.count;
+            grid_view(llimphi_widget_grid::GridSpec {
+                cells,
+                cols: v.cols,
+                metrics: model.metrics,
+                caption: None,
+                truncated_hint: (mostrados < model.entries.len())
+                    .then(|| format!("… y {} más abajo", model.entries.len() - mostrados)),
+                palette: GridPalette::from_theme(&theme),
+            })
+        };
+
+        View::new(Style {
+            flex_direction: FlexDirection::Column,
+            size: Size {
+                width: percent(1.0_f32),
+                height: percent(1.0_f32),
+            },
+            ..Default::default()
+        })
+        .fill(theme.bg_app)
+        // Right-click en la raíz (origen 0,0 ⇒ local == ventana) abre el
+        // menú contextual sobre la entrada seleccionada.
+        .on_right_click_at(|x, y, _w, _h| Some(Msg::ContextMenuOpen(x, y)))
+        .children(vec![menubar, header, ruta, cuerpo])
+    }
+}
+
+/// Cuerpo de una celda: un ícono 📁 para carpetas; para imágenes la
+/// miniatura si está lista, un ⚠ si falló, o un placeholder mientras se
+/// genera.
+fn celda_contenido(model: &Model, e: &Entrada) -> View<Msg> {
+    let theme = &model.theme;
+    let lado = model.metrics.tile_w - 8.0;
+    let base = || Style {
+        size: Size {
+            width: length(lado),
+            height: length(lado),
+        },
+        align_items: Some(AlignItems::Center),
+        justify_content: Some(JustifyContent::Center),
+        ..Default::default()
+    };
+    if e.es_carpeta() {
+        return View::new(base())
+            .fill(theme.bg_panel_alt)
+            .text("📁".to_string(), 44.0, theme.fg_text);
+    }
+    let path = e.path();
+    if let Some(img) = model.thumbs.get(path) {
+        View::new(base()).image(img.clone())
+    } else if model.fallidos.contains(path) {
+        View::new(base())
+            .fill(theme.bg_panel_alt)
+            .text("⚠".to_string(), 20.0, theme.fg_muted)
+    } else {
+        // Placeholder: rectángulo tenue mientras decodifica (MVP — sin
+        // animación; el widget-skeleton se puede enchufar acá luego).
+        View::new(base()).fill(theme.bg_panel_alt)
+    }
+}
+
+/// Breadcrumb de la ruta actual: cada segmento (raíz → hoja) es clicable y
+/// navega a ese ancestro.
+fn barra_ruta(model: &Model) -> View<Msg> {
+    let anc = ancestros(&model.dir);
+    let segs: Vec<String> = anc
+        .iter()
+        .map(|p| {
+            p.file_name()
+                .map(|n| n.to_string_lossy().into_owned())
+                .unwrap_or_else(|| p.to_string_lossy().into_owned())
+        })
+        .collect();
+    let refs: Vec<&str> = segs.iter().map(|s| s.as_str()).collect();
+    let pal = BreadcrumbPalette::from_theme(&model.theme);
+    let bc = breadcrumb_view::<Msg, _>(&refs, Msg::NavegarSegmento, &pal);
+    View::new(Style {
+        size: Size {
+            width: percent(1.0_f32),
+            height: length(BREADCRUMB_H),
+        },
+        padding: Rect {
+            left: length(8.0_f32),
+            right: length(8.0_f32),
+            top: length(0.0_f32),
+            bottom: length(0.0_f32),
+        },
+        align_items: Some(AlignItems::Center),
+        ..Default::default()
+    })
+    .fill(model.theme.bg_panel)
+    .children(vec![bc])
+}
+
+/// Ancestros de un directorio en orden raíz → hoja (incluye el propio dir).
+fn ancestros(dir: &Path) -> Vec<PathBuf> {
+    let mut v: Vec<PathBuf> = dir.ancestors().map(|p| p.to_path_buf()).collect();
+    v.reverse();
+    v
+}
+
+/// Cambia la carpeta actual: re-lista, resetea scroll/selección/preview y
+/// arranca la generación de miniaturas de la nueva ventana.
+fn navegar_a(m: &mut Model, dir: PathBuf, handle: &Handle<Msg>) {
+    m.dir = dir;
+    m.entries = listar(&m.dir, m.orden);
+    m.scroll_fila = 0;
+    m.seleccionado = None;
+    m.preview = None;
+    m.estado = format!("{} ítems", m.entries.len());
+    bombear(m, handle);
+}
+
+/// Barra superior: carpeta, conteo, fila actual y estado.
+fn encabezado(model: &Model, v: &llimphi_widget_grid::VisibleWindow) -> View<Msg> {
+    let theme = &model.theme;
+    let texto = format!(
+        "{} ítems · fila {}/{} · orden:{} (o) · ⏎ abrir · ⌫ subir · +/− zoom · s slideshow · {}",
+        model.entries.len(),
+        v.first_row + 1,
+        v.total_rows.max(1),
+        model.orden.etiqueta(),
+        model.estado,
+    );
+    View::new(Style {
+        size: Size {
+            width: percent(1.0_f32),
+            height: length(HEADER_H),
+        },
+        padding: Rect {
+            left: length(12.0_f32),
+            right: length(12.0_f32),
+            top: length(0.0_f32),
+            bottom: length(0.0_f32),
+        },
+        align_items: Some(AlignItems::Center),
+        ..Default::default()
+    })
+    .fill(theme.bg_panel_alt)
+    .text_aligned(texto, 12.0, theme.fg_text, Alignment::Start)
+}
+
+/// Maneja navegación por teclado: flechas mueven la selección (y arrastran
+/// el scroll para mantenerla visible); Re Pág / Av Pág saltan una pantalla.
+fn manejar_tecla(m: &mut Model, ev: &KeyEvent, handle: &Handle<Msg>) {
+    if m.entries.is_empty() {
+        return;
+    }
+    let v = ventana_visible(m.entries.len(), m.vw, m.vh, m.scroll_fila, &m.metrics);
+    let cols = v.cols.max(1);
+    let filas_pantalla = v.filas_visibles.saturating_sub(1).max(1);
+    let ultimo = m.entries.len() - 1;
+    let cur = m.seleccionado.unwrap_or(0);
+
+    let nuevo: Option<usize> = match &ev.key {
+        Key::Named(NamedKey::ArrowRight) => Some((cur + 1).min(ultimo)),
+        Key::Named(NamedKey::ArrowLeft) => Some(cur.saturating_sub(1)),
+        Key::Named(NamedKey::ArrowDown) => Some((cur + cols).min(ultimo)),
+        Key::Named(NamedKey::ArrowUp) => Some(cur.saturating_sub(cols)),
+        Key::Named(NamedKey::Home) => Some(0),
+        Key::Named(NamedKey::End) => Some(ultimo),
+        Key::Named(NamedKey::PageDown) => {
+            m.scroll_fila = (m.scroll_fila + filas_pantalla).min(v.total_rows.saturating_sub(1));
+            bombear(m, handle);
+            return;
+        }
+        Key::Named(NamedKey::PageUp) => {
+            m.scroll_fila = m.scroll_fila.saturating_sub(filas_pantalla);
+            bombear(m, handle);
+            return;
+        }
+        _ => None,
+    };
+
+    if let Some(sel) = nuevo {
+        m.seleccionado = Some(sel);
+        m.estado = nombre(m.entries[sel].path());
+        asegurar_visible(m, sel, cols, filas_pantalla);
+        bombear(m, handle);
+    }
+}
+
+/// Ajusta `scroll_fila` para que el índice `sel` quede dentro de la
+/// ventana visible (lo arrastra mínimamente arriba o abajo).
+fn asegurar_visible(m: &mut Model, sel: usize, cols: usize, filas_pantalla: usize) {
+    let fila_sel = sel / cols;
+    if fila_sel < m.scroll_fila {
+        m.scroll_fila = fila_sel;
+    } else if fila_sel >= m.scroll_fila + filas_pantalla {
+        m.scroll_fila = fila_sel + 1 - filas_pantalla;
+    }
+}
+
+/// Abre el preview de la imagen `i`: marca el placeholder de carga y lanza
+/// la decodificación full-res en un thread, que reentra con `PreviewListo`.
+fn abrir_preview(m: &mut Model, i: usize, handle: &Handle<Msg>) {
+    let Some(path) = m.entries.get(i).map(|e| e.path().to_path_buf()) else {
+        return;
+    };
+    m.seleccionado = Some(i);
+    m.estado = format!("cargando {}…", nombre(&path));
+    // Placeholder mientras carga (el viewer pinta "—").
+    m.preview = Some((path.clone(), ImagePreviewState::Empty));
+    let p = path.clone();
+    handle.spawn(move || {
+        let st = load_image(&p, MAX_PREVIEW_BYTES);
+        Msg::PreviewListo(p, st)
+    });
+}
+
+/// Mueve el preview a la imagen anterior/siguiente (`d` = ±1), saltando
+/// carpetas. Con `wrap`, da la vuelta en los extremos (para el slideshow).
+fn avanzar_imagen(m: &mut Model, d: i32, wrap: bool, handle: &Handle<Msg>) {
+    let Some((actual, _)) = m.preview.as_ref() else {
+        return;
+    };
+    let Some(cur) = m.entries.iter().position(|e| e.path() == actual) else {
+        return;
+    };
+    let n = m.entries.len() as i32;
+    let mut i = cur as i32 + d;
+    // A lo sumo `n` pasos: evita un loop infinito si todo son carpetas.
+    for _ in 0..n {
+        if i < 0 || i >= n {
+            if wrap {
+                i = (i % n + n) % n;
+            } else {
+                return;
+            }
+        }
+        if !m.entries[i as usize].es_carpeta() {
+            let idx = i as usize;
+            m.seleccionado = Some(idx);
+            abrir_preview(m, idx, handle);
+            return;
+        }
+        i += d;
+    }
+}
+
+/// Programa un tick de slideshow: un thread duerme `SLIDE_SECS` y reentra
+/// con `SlideAvanzar` (que reprograma el siguiente si el slideshow sigue).
+fn programar_slide(handle: &Handle<Msg>) {
+    handle.spawn(move || {
+        std::thread::sleep(Duration::from_secs(SLIDE_SECS));
+        Msg::SlideAvanzar
+    });
+}
+
+/// Ordena una lista de paths según el criterio. `Tamano`/`Fecha` consultan
+/// `metadata` (un `stat` por archivo — se paga una vez por reorden).
+fn ordenar_paths(paths: &mut [PathBuf], orden: Orden) {
+    match orden {
+        Orden::Nombre => paths.sort(),
+        Orden::Tamano => {
+            paths.sort_by_key(|p| std::fs::metadata(p).map(|m| m.len()).unwrap_or(0))
+        }
+        Orden::Fecha => {
+            paths.sort_by_key(|p| std::fs::metadata(p).and_then(|m| m.modified()).ok())
+        }
+    }
+}
+
+/// Recalcula la ventana visible, encola los thumbs que falten, olvida los
+/// que se fueron de pantalla y lanza el próximo lote de generación.
+fn bombear(m: &mut Model, handle: &Handle<Msg>) {
+    let v = ventana_visible(m.entries.len(), m.vw, m.vh, m.scroll_fila, &m.metrics);
+    // Persistir el clamp (no scrollear más allá del fondo).
+    m.scroll_fila = v.first_row;
+
+    let mut visibles: HashSet<PathBuf> = HashSet::with_capacity(v.count);
+    for (orden, i) in (v.first..v.first + v.count).enumerate() {
+        // Las carpetas no generan miniatura (pintan un ícono).
+        if m.entries[i].es_carpeta() {
+            continue;
+        }
+        let path = m.entries[i].path().to_path_buf();
+        visibles.insert(path.clone());
+        if !m.thumbs.contains_key(&path) && !m.fallidos.contains(&path) {
+            // Prioridad = orden de aparición en la ventana (lo de arriba
+            // primero).
+            m.plan.solicitar(path, orden as u64);
+        }
+    }
+    m.plan.olvidar_excepto(&visibles);
+
+    // Eviction: si el cache RAM creció demasiado, conservar sólo las
+    // miniaturas de un rango de entradas alrededor de la ventana visible
+    // (con margen de varias pantallas) — el resto se regenera al volver.
+    if m.thumbs.len() > CAP_THUMBS {
+        let margen = v.cols.saturating_mul(30).max(60);
+        let lo = v.first.saturating_sub(margen);
+        let hi = (v.first + v.count + margen).min(m.entries.len());
+        let mantener: HashSet<PathBuf> = m.entries[lo..hi]
+            .iter()
+            .filter(|e| !e.es_carpeta())
+            .map(|e| e.path().to_path_buf())
+            .collect();
+        m.thumbs.retain(|p, _| mantener.contains(p));
+    }
+
+    for path in m.plan.proximos() {
+        let p = path.clone();
+        let cache = m.cache_disco.clone();
+        handle.spawn(move || {
+            // Pasa por el cache en disco si lo hay: hit ⇒ sin decodificar;
+            // miss ⇒ genera y puebla el disco para la próxima sesión.
+            let res = match &cache {
+                Some(c) => obtener_o_generar(c, &p, THUMB_LADO),
+                None => generar_thumb_de_archivo(&p, THUMB_LADO),
+            };
+            match res {
+                Ok(t) => Msg::ThumbListo(p, t),
+                Err(e) => Msg::ThumbFallo(p, e.to_string()),
+            }
+        });
+    }
+}
+
+/// Lista el contenido navegable de un directorio: subcarpetas (ordenadas
+/// por nombre) primero, luego los archivos de imagen (ordenados por
+/// `orden`). Lo demás se ignora.
+fn listar(dir: &Path, orden: Orden) -> Vec<Entrada> {
+    let rd = match std::fs::read_dir(dir) {
+        Ok(rd) => rd,
+        Err(_) => return Vec::new(),
+    };
+    let mut carpetas: Vec<PathBuf> = Vec::new();
+    let mut imagenes: Vec<PathBuf> = Vec::new();
+    for entrada in rd.flatten() {
+        let p = entrada.path();
+        if p.is_dir() {
+            carpetas.push(p);
+        } else if es_imagen(&p) {
+            imagenes.push(p);
+        }
+    }
+    carpetas.sort();
+    ordenar_paths(&mut imagenes, orden);
+    carpetas
+        .into_iter()
+        .map(Entrada::Carpeta)
+        .chain(imagenes.into_iter().map(|path| {
+            let size = std::fs::metadata(&path).map(|m| m.len()).unwrap_or(0);
+            Entrada::Imagen { path, size }
+        }))
+        .collect()
+}
+
+fn es_imagen(p: &Path) -> bool {
+    p.extension()
+        .and_then(|e| e.to_str())
+        .map(|e| EXTS.contains(&e.to_ascii_lowercase().as_str()))
+        .unwrap_or(false)
+}
+
+fn nombre(p: &Path) -> String {
+    p.file_name()
+        .and_then(|n| n.to_str())
+        .unwrap_or("?")
+        .to_string()
+}
+
+/// Viewport para clampear overlays. La galería trackea `vw` pero `vh` es
+/// el área útil bajo las barras; reconstruimos el alto total de ventana.
+fn viewport_of(model: &Model) -> (f32, f32) {
+    (model.vw, model.vh + MENU_H + HEADER_H + BREADCRUMB_H)
+}
+
+/// Arma el `MenuBarSpec` compartido por `menubar_view` y `menubar_overlay`.
+fn menubar_spec<'a>(menu: &'a AppMenu, model: &Model, theme: &'a Theme) -> MenuBarSpec<'a, Msg> {
+    MenuBarSpec {
+        menu,
+        open: model.menu_open,
+        theme,
+        viewport: viewport_of(model),
+        height: MENU_H,
+        on_open: Arc::new(Msg::MenuOpen),
+        on_command: Arc::new(|c: &str| Msg::MenuCommand(c.to_string())),
+    }
+}
+
+/// Menú principal de la galería. Archivo / Ver / Ayuda — sólo comandos que
+/// mapean a `Msg` reales. Sin "Editar": no hay campos de texto editables.
+fn app_menu() -> AppMenu {
+    AppMenu::new()
+        .menu(
+            Menu::new("Archivo")
+                .item(MenuItem::new("Subir a carpeta padre", "file.up").shortcut("Backspace"))
+                .item(MenuItem::new("Salir", "file.quit").shortcut("Ctrl+Q").separated()),
+        )
+        .menu(
+            Menu::new("Ver")
+                .item(MenuItem::new("Acercar (zoom +)", "view.zoom_in").shortcut("+"))
+                .item(MenuItem::new("Alejar (zoom −)", "view.zoom_out").shortcut("-"))
+                .item(MenuItem::new("Reiniciar zoom", "view.zoom_reset"))
+                .item(MenuItem::new("Ciclar orden", "view.orden").shortcut("o").separated())
+                .item(MenuItem::new("Cambiar tema", "view.theme")),
+        )
+        .menu(Menu::new("Ayuda").item(MenuItem::new("Acerca de", "help.about")))
+}
+
+/// Traduce un command id del menú principal a su efecto real.
+fn handle_menu_command(model: Model, cmd: &str, handle: &Handle<Msg>) -> Model {
+    match cmd {
+        "file.up" => {
+            handle.dispatch(Msg::Subir);
+            model
+        }
+        "file.quit" => std::process::exit(0),
+        "view.zoom_in" => {
+            handle.dispatch(Msg::Zoom(20.0));
+            model
+        }
+        "view.zoom_out" => {
+            handle.dispatch(Msg::Zoom(-20.0));
+            model
+        }
+        "view.zoom_reset" => {
+            // 140px es el tile inicial; pedimos el delta hasta ahí.
+            handle.dispatch(Msg::Zoom(140.0 - model.metrics.tile_w));
+            model
+        }
+        "view.orden" => {
+            handle.dispatch(Msg::CiclarOrden);
+            model
+        }
+        "view.theme" => {
+            handle.dispatch(Msg::CiclarTema);
+            model
+        }
+        // help.about y desconocidos: no-op.
+        _ => model,
+    }
+}
+
+fn main() {
+    llimphi_ui::run::<Gallery>();
+}
diff --git a/02_ruway/nahual/nahual-geo-core/Cargo.toml b/02_ruway/nahual/nahual-geo-core/Cargo.toml
new file mode 100644
index 0000000..0553b54
--- /dev/null
+++ b/02_ruway/nahual/nahual-geo-core/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "nahual-geo-core"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+authors.workspace = true
+publish.workspace = true
+description = "nahual-geo-core — núcleo geoespacial agnóstico de GUI del visor de mapas de nahual. Parsea GeoJSON/GPX/KML y tiles vectoriales (PMTiles v3 + MVT/Mapbox), modela el mundo (MapData/BBox/FeatureProps/MapView), proyecta equirectangular fit-to-bounds con cámara (zoom/pan), y resuelve hit-test, búsqueda, ruteo A* y el basemap por viewport con cache LRU. Sin dependencias de render: el frontend (`nahual-map-viewer-llimphi` u otro: TUI/web/headless) sólo lo pinta."
+
+[dependencies]
+serde_json = { workspace = true }
+quick-xml = { workspace = true }
+flate2 = { workspace = true }
diff --git a/02_ruway/nahual/nahual-geo-core/assets/world-countries.geojson b/02_ruway/nahual/nahual-geo-core/assets/world-countries.geojson
new file mode 100644
index 0000000..7f90602
--- /dev/null
+++ b/02_ruway/nahual/nahual-geo-core/assets/world-countries.geojson
@@ -0,0 +1 @@
+{"type":"FeatureCollection","features":[{"type":"Feature","properties":{"featurecla":"Admin-0 country","scalerank":1,"labelrank":5,"sovereignt":"Costa Rica","sov_a3":"CRI","adm0_dif":0,"level":2,"type":"Sovereign country","tlc":"1","admin":"Costa Rica","adm0_a3":"CRI","geou_dif":0,"geounit":"Costa Rica","gu_a3":"CRI","su_dif":0,"subunit":"Costa Rica","su_a3":"CRI","brk_diff":0,"name":"Costa Rica","name_long":"Costa Rica","brk_a3":"CRI","brk_name":"Costa Rica","brk_group":null,"abbrev":"C.R.","postal":"CR","formal_en":"Republic of Costa Rica","formal_fr":null,"name_ciawf":"Costa Rica","note_adm0":null,"note_brk":null,"name_sort":"Costa Rica","name_alt":null,"mapcolor7":3,"mapcolor8":2,"mapcolor9":4,"mapcolor13":2,"pop_est":5047561,"pop_rank":13,"pop_year":2019,"gdp_md":61801,"gdp_year":2019,"economy":"5. Emerging region: G20","income_grp":"3. Upper middle income","fips_10":"CS","iso_a2":"CR","iso_a2_eh":"CR","iso_a3":"CRI","iso_a3_eh":"CRI","iso_n3":"188","iso_n3_eh":"188","un_a3":"188","wb_a2":"CR","wb_a3":"CRI","woe_id":23424791,"woe_id_eh":23424791,"woe_note":"Exact WOE match as country","adm0_iso":"CRI","adm0_diff":null,"adm0_tlc":"CRI","adm0_a3_us":"CRI","adm0_a3_fr":"CRI","adm0_a3_ru":"CRI","adm0_a3_es":"CRI","adm0_a3_cn":"CRI","adm0_a3_tw":"CRI","adm0_a3_in":"CRI","adm0_a3_np":"CRI","adm0_a3_pk":"CRI","adm0_a3_de":"CRI","adm0_a3_gb":"CRI","adm0_a3_br":"CRI","adm0_a3_il":"CRI","adm0_a3_ps":"CRI","adm0_a3_sa":"CRI","adm0_a3_eg":"CRI","adm0_a3_ma":"CRI","adm0_a3_pt":"CRI","adm0_a3_ar":"CRI","adm0_a3_jp":"CRI","adm0_a3_ko":"CRI","adm0_a3_vn":"CRI","adm0_a3_tr":"CRI","adm0_a3_id":"CRI","adm0_a3_pl":"CRI","adm0_a3_gr":"CRI","adm0_a3_it":"CRI","adm0_a3_nl":"CRI","adm0_a3_se":"CRI","adm0_a3_bd":"CRI","adm0_a3_ua":"CRI","adm0_a3_un":-99,"adm0_a3_wb":-99,"continent":"North America","region_un":"Americas","subregion":"Central America","region_wb":"Latin America & Caribbean","name_len":10,"long_len":10,"abbrev_len":4,"tiny":-99,"homepart":1,"min_zoom":0,"min_label":2.5,"max_label":8,"label_x":-84.077922,"label_y":10.0651,"ne_id":1159320525,"wikidataid":"Q800","name_ar":"كوستاريكا","name_bn":"কোস্টা রিকা","name_de":"Costa Rica","name_en":"Costa Rica","name_es":"Costa Rica","name_fa":"کاستاریکا","name_fr":"Costa Rica","name_el":"Κόστα Ρίκα","name_he":"קוסטה ריקה","name_hi":"कोस्टा रीका","name_hu":"Costa Rica","name_id":"Kosta Rika","name_it":"Costa Rica","name_ja":"コスタリカ","name_ko":"코스타리카","name_nl":"Costa Rica","name_pl":"Kostaryka","name_pt":"Costa Rica","name_ru":"Коста-Рика","name_sv":"Costa Rica","name_tr":"Kosta Rika","name_uk":"Коста-Рика","name_ur":"کوسٹاریکا","name_vi":"Costa Rica","name_zh":"哥斯达黎加","name_zht":"哥斯大黎加","fclass_iso":"Admin-0 country","tlc_diff":null,"fclass_tlc":"Admin-0 country","fclass_us":null,"fclass_fr":null,"fclass_ru":null,"fclass_es":null,"fclass_cn":null,"fclass_tw":null,"fclass_in":null,"fclass_np":null,"fclass_pk":null,"fclass_de":null,"fclass_gb":null,"fclass_br":null,"fclass_il":null,"fclass_ps":null,"fclass_sa":null,"fclass_eg":null,"fclass_ma":null,"fclass_pt":null,"fclass_ar":null,"fclass_jp":null,"fclass_ko":null,"fclass_vn":null,"fclass_tr":null,"fclass_id":null,"fclass_pl":null,"fclass_gr":null,"fclass_it":null,"fclass_nl":null,"fclass_se":null,"fclass_bd":null,"fclass_ua":null,"filename":"CRI.geojson"},"geometry":{"type":"Polygon","coordinates":[[[-82.54619625520348,9.566134751824677],[-82.93289099804358,9.476812038608173],[-82.92715491405916,9.074330145702916],[-82.71918311230053,8.925708726431495],[-82.86865719270477,8.807266343618522],[-82.82977067740516,8.62629547773237],[-82.91317643912421,8.42351715741907],[-82.96578304719736,8.225027980985985],[-83.50843726269431,8.446926581247283],[-83.71147396516908,8.656836249216866],[-83.59631303580665,8.830443223501419],[-83.63264156770784,9.051385809765321],[-83.90988562695374,9.29080272057358],[-84.30340165885636,9.487354030795714],[-84.64764421256866,9.61553742109571],[-84.71335079622777,9.908051866083852],[-84.97566036654133,10.086723130733006],[-84.91137488477024,9.795991522658923],[-85.11092342806532,9.55703969974131],[-85.33948828809227,9.83454214114866],[-85.66078650586698,9.933347479690724],[-85.79744483106285,10.134885565629034],[-85.79170874707843,10.439337266476613],[-85.65931372754667,10.75433095951172],[-85.94172543002176,10.895278428587801],[-85.7125404528073,11.088444932494824],[-85.5618519762442,11.217119248901597],[-84.90300330273895,10.952303371621896],[-84.67306901725627,11.082657172078143],[-84.35593075228104,10.999225572142905],[-84.19017859570485,10.793450018756674],[-83.89505449088595,10.726839097532446],[-83.65561174186158,10.938764146361422],[-83.40231970898296,10.395438137244653],[-83.01567664257517,9.992982082555557],[-82.54619625520348,9.566134751824677]]]}},{"type":"Feature","properties":{"featurecla":"Admin-0 country","scalerank":1,"labelrank":5,"sovereignt":"Nicaragua","sov_a3":"NIC","adm0_dif":0,"level":2,"type":"Sovereign country","tlc":"1","admin":"Nicaragua","adm0_a3":"NIC","geou_dif":0,"geounit":"Nicaragua","gu_a3":"NIC","su_dif":0,"subunit":"Nicaragua","su_a3":"NIC","brk_diff":0,"name":"Nicaragua","name_long":"Nicaragua","brk_a3":"NIC","brk_name":"Nicaragua","brk_group":null,"abbrev":"Nic.","postal":"NI","formal_en":"Republic of Nicaragua","formal_fr":null,"name_ciawf":"Nicaragua","note_adm0":null,"note_brk":null,"name_sort":"Nicaragua","name_alt":null,"mapcolor7":1,"mapcolor8":4,"mapcolor9":1,"mapcolor13":9,"pop_est":6545502,"pop_rank":13,"pop_year":2019,"gdp_md":12520,"gdp_year":2019,"economy":"6. Developing region","income_grp":"4. 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The patch goes on, but was cut here: fetch the commit with git to see it whole.