feat: compile ladybug CGO with Zig, not gcc (#24)

API image is Go-only (compose target api). Python rebuild is profile
index. bin/cgo/zig pins Zig 0.14.1, liblbug, and tokenizers.

bin/tools/test_bin_layout.py

@@ -1,6 +1,7 @@
 """D14 layout: bin/{subject}/{method}.go, libs in internal/, one go.mod."""
 from __future__ import annotations
 
+import os
 import unittest
 from pathlib import Path
 
@@ -157,3 +158,21 @@ class BinLayoutTest(unittest.TestCase):
         for line in first.splitlines():
             if "go-git/go-git" in line:
                 self.assertNotIn("indirect", line)
+
+    def test_cgo_uses_zig_not_gcc(self) -> None:
+        for rel in ("bin/cgo/zig", "bin/cgo/zcc", "bin/cgo/zc++"):
+            p = ROOT / rel
+            self.assertTrue(p.is_file(), f"missing {rel}")
+            self.assertTrue(
+                os.access(p, os.X_OK),
+                f"{rel} must be executable",
+            )
+        zig = (ROOT / "bin" / "cgo" / "zig").read_text()
+        self.assertIn("zig cc", zig)
+        self.assertIn("0.14.1", zig)
+        zcc = (ROOT / "bin" / "cgo" / "zcc").read_text()
+        self.assertIn('exec "$ZIG" cc', zcc)
+        self.assertNotIn("command -v gcc", zcc)
+        search = (ROOT / "bin" / "kb" / "search").read_text()
+        self.assertIn("bin/cgo/zig", search)
+        self.assertNotIn("command -v gcc", search)

bin/tools/test_published_docs.py

@@ -89,6 +89,20 @@ class PublishedDocsTest(unittest.TestCase):
         self.assertFalse((ROOT / "skills" / "db-yaml").exists())
         self.assertTrue((ROOT / "skills" / "postgres" / "SKILL.md").is_file())
 
+    def test_cgo_zig_and_index_profile(self) -> None:
+        plan = (ROOT / "PLAN.md").read_text()
+        self.assertIn("D21", plan)
+        self.assertIn("zig cc", plan)
+        dockerfile = (ROOT / "Dockerfile").read_text()
+        self.assertIn("bin/cgo/zcc", dockerfile)
+        self.assertIn("FROM debian:bookworm-slim AS api", dockerfile)
+        self.assertIn("FROM python:3.12-slim AS index", dockerfile)
+        api = dockerfile[dockerfile.index("FROM debian:bookworm-slim AS api") :]
+        self.assertNotIn("pip install", api)
+        compose = (ROOT / "compose.yaml").read_text()
+        self.assertIn('profiles: ["index"]', compose)
+        self.assertIn("target: api", compose)
+
     def test_readme_search_escalates_web(self) -> None:
         text = (ROOT / "README.md").read_text()
         self.assertIn("--no-web", text)