feat(core,cli): implement external agent polyfills and finalize teams

- Implement External Agent kind with personality overlays (Claude Code, Codex)
- Enhance AgentLoader and Registry for external agent discovery and registration
- Fix critical startup race condition in Config registry initialization
- Add TeamSelectionDialog and ActiveTeamIndicator to CLI UI
- Include comprehensive integration and unit tests for agent teams
- Refactor SubagentToolWrapper for type-safe external agent invocation

packages/cli/src/ui/components/TeamSelectionDialog.test.tsx

@@ -35,7 +35,8 @@ describe('<TeamSelectionDialog />', () => {
     mockOnSelect.mockReset();
   });
 
-  const renderComponent = async () => renderWithProviders(
+  const renderComponent = async () =>
+    renderWithProviders(
       <TeamSelectionDialog teams={mockTeams} onSelect={mockOnSelect} />,
     );