- Add options.json parser with mdDoc support - Add nixpkgs indexer using nix-build - Implement all MCP tool handlers: - search_options: Full-text search with filters - get_option: Option details with children - get_file: Fetch file contents - index_revision: Build and index options - list_revisions: Show indexed versions - delete_revision: Remove indexed data - Add parser tests Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>