docs: update docs for tools.agent/tools.subagent and Navi Code TUI ...

- profiles.md: document tools.agent/tools.subagent structure, deprecate enabled_tools
- tools.md: move web tools to MCP section, fix mcp__navi-web__* names, add create_mcp_server/test_mcp_tool/mcp_status/recall tools
- api.md: update /agents/profiles and /admin/profiles/{id} response schemas, fix MCP examples
- navi_code.md: correct navi_code tool list (MCP disabled)
- navi_code_cli.md: add /thinking, /compact, correct TUI layout
- index.md: add navi_code, terminal client, pydantic-settings
- testing.md: refresh test directory layout, replace stale coverage roadmap
- agent.md: mention tools.agent/tools.subagent in loop

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

Navi Code TUI: review fixes for Phase 5 ...

- Fix raw CLI session API fields (session_id/name/preview)

- Add --mouse/--no-mouse flags and persistent TUI settings coercion

- Make attach_session/apply_theme public, add ChatPanel.clear()

- Deduplicate session selection handlers and editor error handling

- Update docs and tests

Navi Code TUI: Phase 5.2 — SessionsPanel, /export, integration tests ...

- Add right-side SessionsPanel widget (DataTable) listing server sessions.
- Wire SessionsPanel into TUI layout and session selection flow.
- Add SessionSelected / SessionListUpdated events and refresh logic.
- Implement /export slash command: markdown rendering + $EDITOR.
- Update /new, /sessions, /switch, /profile to use session_id/name/preview.
- Add integration tests for SessionsPanel and /export; update layout test.
- Update docs/navi_code_cli.md with new panel and command.

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

Navi Code: Phase 2 — CLI terminal client, tests, docs ...

- Add clients/terminal package: config, state, REST API wrappers, WebSocket
  client, renderer, and click-based interactive CLI.
- Wire navi-code console script via pyproject.toml.
- Add unit and WebSocket integration tests for the terminal client.
- Update docs/profiles.md, docs/config.md, README.md with navi_code profile
  and default-profile instructions.
- Add docs/navi_code.md setup guide and docs/navi_code_cli.md usage reference.
- Fix lint in new test files and test_auth_disabled.py.

Tested: 459 passed, 1 skipped (excluded unrelated websocket test).

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