fix: Robustness improvements for RAG tests and GUI stability

- Added import sys to src/api_hook_client.py.
- Fixed App.__getattr__ to use direct attribute access on controller to avoid recursion.
- Simplified _get_app_attr and _has_app_attr in src/api_hooks.py.
- Centralized RAG and symbol enrichment in AppController._handle_request_event.
- Updated 	ests/test_symbol_parsing.py to match the new enrichment flow.
- Removed redundant task appending from i_status and mma_status setters.
- Improved _sync_rag_engine to only set 'ready' status after indexing is confirmed.
- Updated 	est_status_encapsulation.py to reflect setter changes.

tests/test_rag_phase4_stress.py

@@ -27,6 +27,7 @@ def test_rag_large_codebase_verification_sim(live_gui):
 
  try:
   # 2. Configure project through Hook API
+  client.set_value('rag_collection_name', 'test_stress')
   client.set_value('files', file_names)
   client.set_value('rag_enabled', True)
   client.set_value('rag_source', 'chroma')
@@ -97,14 +98,18 @@ def test_rag_large_codebase_verification_sim(live_gui):
   
   # Wait for completion
   success = False
+  status = "unknown"
   for _ in range(50):
    state = client.get_gui_state()
-   if state.get('ai_status') == 'done':
+   status = state.get('ai_status', 'unknown')
+   if status == 'done':
     success = True
     break
+   if "error" in status.lower():
+    pytest.fail(f"AI request failed with error: {status}")
    time.sleep(0.5)
   
-  assert success, "AI request timed out"
+  assert success, f"AI request timed out. Final status: {status}"
   
   # Verify retrieved context in discussion
   session = client.get_session()