feat(casan): add native plugin facade

packages/casan-devkit/tests/hybrid-install-tests.sh

@@ -70,6 +70,10 @@ for forbidden in (
 ):
     assert not (root / forbidden).exists(), forbidden
 for required in (
+    ".codex-plugin/plugin.json",
+    ".claude-plugin/plugin.json",
+    ".claude-plugin/marketplace.json",
+    "skills/casan/SKILL.md",
     "packages/casan-harness/assets/local-viewer/index.html",
     "packages/casan-harness/assets/local-viewer/app.css",
     "packages/casan-harness/assets/local-viewer/app.js",

packages/casan-devkit/tests/native-plugin-tests.py

@@ -0,0 +1,76 @@
+#!/usr/bin/env python3
+"""Validate the repository-root CASAN native plugin facades."""
+
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[3]
+VERSION = (ROOT / "VERSION").read_text(encoding="utf-8").strip()
+
+
+def load_json(relative_path: str) -> dict[str, object]:
+    payload = json.loads((ROOT / relative_path).read_text(encoding="utf-8"))
+    assert isinstance(payload, dict), relative_path
+    return payload
+
+
+def main() -> None:
+    codex = load_json(".codex-plugin/plugin.json")
+    assert codex["name"] == "casan"
+    assert codex["version"] == VERSION
+    assert codex["skills"] == "./skills/"
+    assert "hooks" not in codex
+    assert codex["license"] == "Proprietary"
+
+    interface = codex["interface"]
+    assert isinstance(interface, dict)
+    for field in (
+        "displayName",
+        "shortDescription",
+        "longDescription",
+        "developerName",
+        "category",
+        "capabilities",
+        "defaultPrompt",
+    ):
+        assert interface.get(field), field
+
+    claude = load_json(".claude-plugin/plugin.json")
+    assert claude["name"] == "casan"
+    assert claude["version"] == VERSION
+    assert claude["skills"] == ["./skills/"]
+    assert "hooks" not in claude
+
+    marketplace = load_json(".claude-plugin/marketplace.json")
+    plugins = marketplace["plugins"]
+    assert isinstance(plugins, list) and len(plugins) == 1
+    entry = plugins[0]
+    assert isinstance(entry, dict)
+    assert entry["name"] == "casan"
+    assert entry["source"] == "./"
+    assert entry["version"] == VERSION
+
+    skill = (ROOT / "skills/casan/SKILL.md").read_text(encoding="utf-8")
+    assert skill.startswith("---\nname: casan\n")
+    assert "description:" in skill
+    assert "[TODO:" not in skill
+    assert (ROOT / "skills/casan/agents/openai.yaml").is_file()
+
+    levels = load_json("packaging/levels.json")
+    level_map = levels["levels"]
+    assert isinstance(level_map, dict)
+    core = level_map["core"]
+    assert isinstance(core, dict)
+    includes = core["includes"]
+    assert isinstance(includes, list)
+    for required in (".codex-plugin", ".claude-plugin", "skills"):
+        assert required in includes, required
+
+    print(f"NATIVE_PLUGIN_PASS version={VERSION} codex=true claude=true")
+
+
+if __name__ == "__main__":
+    main()