feat: Implement adaptive RRF weights and query intent detection

- Added integration tests for adaptive RRF weights in hybrid search.
- Enhanced query intent detection with new classifications: keyword, semantic, and mixed.
- Introduced symbol boosting in search results based on explicit symbol matches.
- Implemented embedding-based reranking with configurable options.
- Added global symbol index for efficient symbol lookups across projects.
- Improved file deletion handling on Windows to avoid permission errors.
- Updated chunk configuration to increase overlap for better context.
- Modified package.json test script to target specific test files.
- Created comprehensive writing style guidelines for documentation.
- Added TypeScript tests for query intent detection and adaptive weights.
- Established performance benchmarks for global symbol indexing.

codex-lens/tests/test_search_comparison.py

@@ -466,7 +466,18 @@ class TestDiagnostics:
 
         yield db_path
         if db_path.exists():
-            db_path.unlink()
+            for attempt in range(5):
+                try:
+                    db_path.unlink()
+                    break
+                except PermissionError:
+                    time.sleep(0.05 * (attempt + 1))
+            else:
+                # Best-effort cleanup (Windows SQLite locks can linger briefly).
+                try:
+                    db_path.unlink(missing_ok=True)
+                except (PermissionError, OSError):
+                    pass
 
     def test_diagnose_empty_database(self, empty_db):
         """Diagnose behavior with empty database."""