refactor(agent): change consciousness loop from non-blocking to sequential mode

backend/agent/engine.py

@@ -49,16 +49,12 @@ class AgentEngine:
         }
 
     async def run(self):
-        """Main consciousness loop - LLM driven (non-blocking mode)"""
+        """Main consciousness loop - sequential mode"""
         print("Agent consciousness started...")
 
-        # 非阻塞模式：每次思考完成后立即启动下一次，不等待
-        # 使用 create_task 让每次思考在后台运行
+        # 等待每个思考完成后再启动下一个，避免并发堆积
         while True:
-            # 创建新的思考任务，不等待完成
-            asyncio.create_task(self._let_llm_decide())
-            # 不等待，直接继续下一轮
-            await asyncio.sleep(0.1)  # 短暂停顿让出事件循环
+            await self._let_llm_decide()
 
     async def _let_llm_decide(self):
         """Let LLM decide next action"""