sergio/takana

Triage de la 2da pasada, todos del mismo frente (crate Rust con dep-C que zig-cc rompe):
- helix: gueto gcc (tree-house-bindings/tree-sitter; cc-rs detecta familia con `zig -E` y falla)
- xplr: gueto gcc (mlua-sys/Lua; link suelta _Unwind_* de libgcc bajo zig-cc)
- hck: + deps.build=[zlib] (libdeflate ya pasó con gcc, ahora libz-sys pide -lz; gitui precedente)

NOTA: hck y zellij declaran zlib (corpus), pero resolve_build_dep busca $base_dir/zlib.toml y
en incoming/ no está ⇒ se construyen aparte desde recipes/ (donde zlib.toml es hermano).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

diff --git a/recipes/incoming/hck.toml b/recipes/incoming/hck.toml
index 9dd28b78..5d9a9da5 100644
--- a/recipes/incoming/hck.toml
+++ b/recipes/incoming/hck.toml
@@ -20,5 +20,9 @@ flags    = ["--bin", "hck"]
 [build.phases]
 install = "mkdir -p /out/usr/bin && cp target/release/hck /out/usr/bin/hck"
 
+# libz-sys (vía gzp/libdeflate) enlaza -lz; el lab materializa zlib (libz.a) como overlay (igual que gitui).
+[deps]
+build = ["zlib"]
+
 # buildInputs de nix (NO deps de hammer — cargo vendorea; backend Rust por
 # defecto). Si algún sys-crate C falla, adaptá per-paquete (patch/feature): cmake
diff --git a/recipes/incoming/helix.toml b/recipes/incoming/helix.toml
index 3fe224e2..6b02830a 100644
--- a/recipes/incoming/helix.toml
+++ b/recipes/incoming/helix.toml
@@ -11,8 +11,10 @@ tarball = "https://github.com/helix-editor/helix/archive/25.07.1/helix-25.07.1.t
 sha256  = "27c8bc3eba46bc7bab1e3629c6b28ff94882eeff17366b3ea69cd8ceffba7541"
 patches = ["fix-gotmpl-grammar-source.patch"]
 
+# GUETO gcc: helix trae tree-house-bindings (tree-sitter en C); cc-rs hace detección de familia
+# de compilador con `zig -E` y zig la rechaza. compiler="gcc" usa el musl gcc de Alpine.
 [build]
-compiler = "zig-cc"
+compiler = "gcc"
 target   = "x86_64-linux-musl"
 link     = "static"
 flags    = []
diff --git a/recipes/incoming/xplr.toml b/recipes/incoming/xplr.toml
index 13bb8932..029f0c83 100644
--- a/recipes/incoming/xplr.toml
+++ b/recipes/incoming/xplr.toml
@@ -9,8 +9,11 @@ version = "1.1.0"
 repo   = "https://github.com/sayanarijit/xplr"
 commit = "db0e781f14ba4ab0242beb36ace87b679c744d4e"
 
+# GUETO gcc: xplr embebe mlua-sys (compila Lua en C); bajo zig-cc el link falla con símbolos de
+# unwinding sueltos (_Unwind_GetCFA/_Unwind_DeleteException, de libgcc). compiler="gcc" usa el musl
+# gcc de Alpine que aporta su runtime de unwinding.
 [build]
-compiler = "zig-cc"
+compiler = "gcc"
 target   = "x86_64-linux-musl"
 link     = "static"
 flags    = ["--bin", "xplr"]