fix: improve CodexLens env defaults, self-exclusion, and route handling

- Adjust env defaults (embed batch 64, workers 2) and add HNSW/chunking params
- Exclude .codexlens directory from indexing and file watching
- Expand codexlens-routes with improved validation and error handling
- Enhance integration tests for broader route coverage

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

codex-lens-v2/tests/unit/test_bridge.py

@@ -9,7 +9,13 @@ from unittest.mock import patch
 
 import pytest
 
-from codexlens_search.bridge import _build_parser, _json_output, _error_exit
+from codexlens_search.bridge import (
+    DEFAULT_EXCLUDES,
+    _build_parser,
+    _json_output,
+    _error_exit,
+    should_exclude,
+)
 
 
 # ---------------------------------------------------------------------------
@@ -71,6 +77,12 @@ class TestParser:
         args = self.parser.parse_args([])
         assert args.command is None
 
+    def test_default_excludes_include_codexlens(self):
+        assert ".codexlens" in DEFAULT_EXCLUDES
+
+    def test_should_exclude_codexlens_directory(self):
+        assert should_exclude(Path(".codexlens") / "metadata.db", DEFAULT_EXCLUDES) is True
+
 
 # ---------------------------------------------------------------------------
 # JSON output helpers