fix(06): revise plans based on checker feedback

- Added missing <verify> element to Plan 06-05
- Created Plan 06-07 for help system gap
- Created Plan 06-08 for exit command gap
- Now addresses all 4 gaps identified by checker

.planning/phases/06-cli-interface/06-05-PLAN.md

@@ -74,6 +74,24 @@ Output: Working session persistence with contextual recovery messages
 from src.mai.conversation.state import ConversationState
 import inspect
 
+# Check method exists
+if hasattr(ConversationState, 'set_conversation_history'):
+    print('✓ set_conversation_history method exists')
+    
+    # Check method signature
+    sig = inspect.signature(ConversationState.set_conversation_history)
+    print(f'✓ Method signature: {sig}')
+else:
+    print('✗ set_conversation_history method missing')
+    exit(1)
+"
+  </verify>
+  <verify>
+    # Test the method exists and works
+    python -c "
+from src.mai.conversation.state import ConversationState
+import inspect
+
 # Check method exists
 if hasattr(ConversationState, 'set_conversation_history'):
     print('✓ set_conversation_history method exists')