feat(codexlens): add CodexLens code indexing platform with incremental updates

- Add CodexLens Python package with SQLite FTS5 search and tree-sitter parsing
- Implement workspace-local index storage (.codexlens/ directory)
- Add incremental update CLI command for efficient file-level index refresh
- Integrate CodexLens with CCW tools (codex_lens action: update)
- Add CodexLens Auto-Sync hook template for automatic index updates on file changes
- Add CodexLens status card in CCW Dashboard CLI Manager with install/init buttons
- Add server APIs: /api/codexlens/status, /api/codexlens/bootstrap, /api/codexlens/init

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

codex-lens/src/codexlens/errors.py

@@ -0,0 +1,24 @@
+"""CodexLens exception hierarchy."""
+
+from __future__ import annotations
+
+
+class CodexLensError(Exception):
+    """Base class for all CodexLens errors."""
+
+
+class ConfigError(CodexLensError):
+    """Raised when configuration is invalid or cannot be loaded."""
+
+
+class ParseError(CodexLensError):
+    """Raised when parsing or indexing a file fails."""
+
+
+class StorageError(CodexLensError):
+    """Raised when reading/writing index storage fails."""
+
+
+class SearchError(CodexLensError):
+    """Raised when a search operation fails."""
+