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/config.py

@@ -0,0 +1,190 @@
+"""Configuration system for CodexLens."""
+
+from __future__ import annotations
+
+import os
+from dataclasses import dataclass, field
+from pathlib import Path
+from typing import Any, Dict, List, Optional
+
+from .errors import ConfigError
+
+
+# Workspace-local directory name
+WORKSPACE_DIR_NAME = ".codexlens"
+
+
+def _default_global_dir() -> Path:
+    """Get global CodexLens data directory."""
+    env_override = os.getenv("CODEXLENS_DATA_DIR")
+    if env_override:
+        return Path(env_override).expanduser().resolve()
+    return (Path.home() / ".codexlens").resolve()
+
+
+def find_workspace_root(start_path: Path) -> Optional[Path]:
+    """Find the workspace root by looking for .codexlens directory.
+
+    Searches from start_path upward to find an existing .codexlens directory.
+    Returns None if not found.
+    """
+    current = start_path.resolve()
+
+    # Search up to filesystem root
+    while current != current.parent:
+        workspace_dir = current / WORKSPACE_DIR_NAME
+        if workspace_dir.is_dir():
+            return current
+        current = current.parent
+
+    # Check root as well
+    workspace_dir = current / WORKSPACE_DIR_NAME
+    if workspace_dir.is_dir():
+        return current
+
+    return None
+
+
+@dataclass
+class Config:
+    """Runtime configuration for CodexLens.
+
+    - data_dir: Base directory for all persistent CodexLens data.
+    - venv_path: Optional virtualenv used for language tooling.
+    - supported_languages: Language IDs and their associated file extensions.
+    - parsing_rules: Per-language parsing and chunking hints.
+    """
+
+    data_dir: Path = field(default_factory=_default_global_dir)
+    venv_path: Path = field(default_factory=lambda: _default_global_dir() / "venv")
+    supported_languages: Dict[str, Dict[str, Any]] = field(
+        default_factory=lambda: {
+            "python": {"extensions": [".py"], "tree_sitter_language": "python"},
+            "javascript": {"extensions": [".js", ".jsx"], "tree_sitter_language": "javascript"},
+            "typescript": {"extensions": [".ts", ".tsx"], "tree_sitter_language": "typescript"},
+            "java": {"extensions": [".java"], "tree_sitter_language": "java"},
+            "go": {"extensions": [".go"], "tree_sitter_language": "go"},
+            "zig": {"extensions": [".zig"], "tree_sitter_language": "zig"},
+            "objective-c": {"extensions": [".m", ".mm"], "tree_sitter_language": "objc"},
+        }
+    )
+    parsing_rules: Dict[str, Dict[str, Any]] = field(
+        default_factory=lambda: {
+            "default": {
+                "max_chunk_chars": 4000,
+                "max_chunk_lines": 200,
+                "overlap_lines": 20,
+            }
+        }
+    )
+
+    def __post_init__(self) -> None:
+        try:
+            self.data_dir = self.data_dir.expanduser().resolve()
+            self.venv_path = self.venv_path.expanduser().resolve()
+            self.data_dir.mkdir(parents=True, exist_ok=True)
+        except Exception as exc:
+            raise ConfigError(f"Failed to initialize data_dir at {self.data_dir}: {exc}") from exc
+
+    @property
+    def cache_dir(self) -> Path:
+        """Directory for transient caches."""
+        return self.data_dir / "cache"
+
+    @property
+    def index_dir(self) -> Path:
+        """Directory where index artifacts are stored."""
+        return self.data_dir / "index"
+
+    @property
+    def db_path(self) -> Path:
+        """Default SQLite index path."""
+        return self.index_dir / "codexlens.db"
+
+    def ensure_runtime_dirs(self) -> None:
+        """Create standard runtime directories if missing."""
+        for directory in (self.cache_dir, self.index_dir):
+            try:
+                directory.mkdir(parents=True, exist_ok=True)
+            except Exception as exc:
+                raise ConfigError(f"Failed to create directory {directory}: {exc}") from exc
+
+    def language_for_path(self, path: str | Path) -> str | None:
+        """Infer a supported language ID from a file path."""
+        extension = Path(path).suffix.lower()
+        for language_id, spec in self.supported_languages.items():
+            extensions: List[str] = spec.get("extensions", [])
+            if extension in extensions:
+                return language_id
+        return None
+
+    def rules_for_language(self, language_id: str) -> Dict[str, Any]:
+        """Get parsing rules for a specific language, falling back to defaults."""
+        return {**self.parsing_rules.get("default", {}), **self.parsing_rules.get(language_id, {})}
+
+
+@dataclass
+class WorkspaceConfig:
+    """Workspace-local configuration for CodexLens.
+
+    Stores index data in project/.codexlens/ directory.
+    """
+
+    workspace_root: Path
+
+    def __post_init__(self) -> None:
+        self.workspace_root = Path(self.workspace_root).resolve()
+
+    @property
+    def codexlens_dir(self) -> Path:
+        """The .codexlens directory in workspace root."""
+        return self.workspace_root / WORKSPACE_DIR_NAME
+
+    @property
+    def db_path(self) -> Path:
+        """SQLite index path for this workspace."""
+        return self.codexlens_dir / "index.db"
+
+    @property
+    def cache_dir(self) -> Path:
+        """Cache directory for this workspace."""
+        return self.codexlens_dir / "cache"
+
+    def initialize(self) -> None:
+        """Create the .codexlens directory structure."""
+        try:
+            self.codexlens_dir.mkdir(parents=True, exist_ok=True)
+            self.cache_dir.mkdir(parents=True, exist_ok=True)
+
+            # Create .gitignore to exclude cache but keep index
+            gitignore_path = self.codexlens_dir / ".gitignore"
+            if not gitignore_path.exists():
+                gitignore_path.write_text(
+                    "# CodexLens workspace data\n"
+                    "cache/\n"
+                    "*.log\n"
+                )
+        except Exception as exc:
+            raise ConfigError(f"Failed to initialize workspace at {self.codexlens_dir}: {exc}") from exc
+
+    def exists(self) -> bool:
+        """Check if workspace is already initialized."""
+        return self.codexlens_dir.is_dir() and self.db_path.exists()
+
+    @classmethod
+    def from_path(cls, path: Path) -> Optional["WorkspaceConfig"]:
+        """Create WorkspaceConfig from a path by finding workspace root.
+
+        Returns None if no workspace found.
+        """
+        root = find_workspace_root(path)
+        if root is None:
+            return None
+        return cls(workspace_root=root)
+
+    @classmethod
+    def create_at(cls, path: Path) -> "WorkspaceConfig":
+        """Create a new workspace at the given path."""
+        config = cls(workspace_root=path)
+        config.initialize()
+        return config