feat: add CLI Command Node and Prompt Node components for orchestrator

- Implemented CliCommandNode component for executing CLI tools with AI models.
- Implemented PromptNode component for constructing AI prompts with context.
- Added styling for mode and tool badges in both components.
- Enhanced user experience with command and argument previews, execution status, and error handling.

test: add comprehensive tests for ask_question tool

- Created direct test for ask_question tool execution.
- Developed end-to-end tests to validate ask_question tool integration with WebSocket and A2UI surfaces.
- Implemented simple and integrated WebSocket tests to ensure proper message handling and surface reception.
- Added tool registration test to verify ask_question tool is correctly registered.

chore: add WebSocket listener and simulation tests

- Added WebSocket listener for A2UI surfaces to facilitate testing.
- Implemented frontend simulation test to validate complete flow from backend to frontend.
- Created various test scripts to ensure robust testing of ask_question tool functionality.

ccw/frontend/src/components/layout/AppShell.tsx

@@ -14,7 +14,7 @@ import { NotificationPanel } from '@/components/notification';
 import { AskQuestionDialog } from '@/components/a2ui/AskQuestionDialog';
 import { useNotificationStore, selectCurrentQuestion } from '@/stores';
 import { useWorkflowStore } from '@/stores/workflowStore';
-import { useWebSocketNotifications } from '@/hooks';
+import { useWebSocketNotifications, useWebSocket } from '@/hooks';
 
 export interface AppShellProps {
   /** Initial sidebar collapsed state */
@@ -103,7 +103,8 @@ export function AppShell({
   const currentQuestion = useNotificationStore(selectCurrentQuestion);
   const setCurrentQuestion = useNotificationStore((state) => state.setCurrentQuestion);
 
-  // Initialize WebSocket notifications handler
+  // Initialize WebSocket connection and notifications handler
+  useWebSocket();
   useWebSocketNotifications();
 
   // Load persistent notifications from localStorage on mount

ccw/frontend/src/components/layout/Sidebar.tsx

@@ -117,6 +117,7 @@ const navGroupDefinitions: NavGroupDef[] = [
     icon: Cog,
     items: [
       { path: '/settings', labelKey: 'navigation.main.settings', icon: Settings },
+      { path: '/settings/mcp', labelKey: 'navigation.main.mcp', icon: Server },
       { path: '/settings/rules', labelKey: 'navigation.main.rules', icon: Shield },
       { path: '/settings/codexlens', labelKey: 'navigation.main.codexlens', icon: Sparkles },
       { path: '/api-settings', labelKey: 'navigation.main.apiSettings', icon: Server },