feat(retrieval): add optional Qwen semantic layer

scripts/test-semantic-retrieval.py

@@ -0,0 +1,39 @@
+import hashlib
+import importlib.util
+import json
+from pathlib import Path
+import tempfile
+import unittest
+
+
+ROOT = Path(__file__).resolve().parent.parent
+SPEC = importlib.util.spec_from_file_location('semantic_retrieval', ROOT / 'scripts/lib/semantic-retrieval.py')
+MODULE = importlib.util.module_from_spec(SPEC)
+SPEC.loader.exec_module(MODULE)
+
+
+class SemanticRetrievalTests(unittest.TestCase):
+    def test_disable_removes_owned_runtime_and_registration(self):
+        with tempfile.TemporaryDirectory() as directory:
+            home = Path(directory) / 'home'
+            target = home / '.my-ai-configuration/semantic-retrieval'
+            target.mkdir(parents=True)
+            for name in MODULE.FILES:
+                (target / name).write_text(name)
+            state_path = target.parent / 'semantic-retrieval.json'
+            state_path.write_text(json.dumps({'version': 1, 'clients': ['codex'], 'files': {
+                name: hashlib.sha256((target / name).read_bytes()).hexdigest() for name in MODULE.FILES}}))
+            calls = []
+            original = MODULE.command
+            MODULE.command = lambda client, arguments, home, dry_run: calls.append((client, arguments))
+            try:
+                MODULE.sync(ROOT, home, ['codex'], False, False, False)
+            finally:
+                MODULE.command = original
+            self.assertEqual(calls[0][1], ['codex', 'mcp', 'remove', MODULE.NAME])
+            self.assertFalse(target.exists())
+            self.assertFalse(state_path.exists())
+
+
+if __name__ == '__main__':
+    unittest.main()