debug: add print statements to track executor initialization

dashboard/backend/services/agent_executor.py

@@ -320,5 +320,14 @@ async def get_executor() -> AgentExecutor:
 
 async def start_executor():
     """Start the executor service"""
-    executor = await get_executor()
+    print("start_executor() called")
-    await executor.start()
+    try:
+        executor = await get_executor()
+        print(f"Executor obtained: {executor is not None}, running: {executor.running}")
+        await executor.start()
+        print("Executor start() completed (should not reach here as start() is infinite loop)")
+    except Exception as e:
+        print(f"ERROR in start_executor: {e}")
+        import traceback
+        traceback.print_exc()
+        raise