- Introduce `show_onboarding` UI setting (default true) and persist its state after first launch.
- Show onboarding status line and system status on initial run; fallback to normal status thereafter.
- Implement `show_tutorial` method displaying keybinding tips and system status.
- Register `:tutorial` command in command palette.
- Add migration documentation explaining `schema_version` update and deprecation of `agent.max_tool_calls`.
- Update README with description of the new tutorial command.
