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.

src/api_hook_client.py

@@ -63,11 +63,16 @@ class ApiHookClient:
     response = requests.post(url, json=data, headers=headers, timeout=timeout)
    elif method == 'DELETE':
     response = requests.delete(url, headers=headers, timeout=timeout)
+   
    if response.status_code == 200:
     return response.json()
+   else:
+    sys.stderr.write(f"[DEBUG Client] Request failed: {method} {path} - status={response.status_code}\n")
+    sys.stderr.flush()
    return None
-  except Exception:
-  # Silently ignore connection errors unless we are in a wait loop
+  except Exception as e:
+   sys.stderr.write(f"[DEBUG Client] Request error: {method} {path} - {e}\n")
+   sys.stderr.flush()
    return None
 
  def wait_for_server(self, timeout: int = 15) -> bool: