…rn and replace deprecated aliases

- Reordered imports across all modules to group standard library, third-party (textual/pydantic/structlog), and local package imports
- Replaced `asyncio.TimeoutError` with built-in `TimeoutError` in app.py file dialog functions
- Replaced `timezone.utc` with `UTC` constant in persistence.py
- Changed `getattr(response, "models")` to direct attribute access `response.models` in chat.py
- Moved

…wlist-based filtering

- Renamed `ollama_chat/tools.py` to `ollama_chat/tooling.py` to avoid naming conflict with standard library
- Updated all imports across app.py and test files to reference `tooling` module
- Introduced built-in tool adapter that exposes allowlisted subset of custom tools (`codesearch`, `edit`, `grep`, `list`, `read`) by default when `enable_custom_tools=False`
- Modified `build_registry()` to enable built-in adapter by default;

…ls with valid IDs

- Deleted `allow = {"codesearch", "edit", "grep", "list", "read"}` set from `to_specs()` method
- Changed tool filtering condition from `if not name or name not in allow:` to `if not name:` to accept any tool with a non-empty ID
- Removes allowlist-based filtering introduced in previous commit, enabling all discovered tools by default

…talog and usage examples

- Added "Function tools with Ollama (alpha/experimental)" subsection under Capabilities
- Documented dual tool format: JSON function tools from schema specs and Python callables for built-in integrations
- Added experimental warning about untested tools and potential truncation
- Cataloged all available tools organized by category (Files & search, Editing, Runtime, Planning & state, Introspection & utility