feat: auto-inject tool_call on first reply (deepseek fails to follow prompt)

pipeline_service/agent_loop_v2.py

@@ -136,6 +136,21 @@ class AgentExecutor:
                 action_type = act.get("action", "")
 
                 if action_type == "reply":
+                    # 第一轮就 reply 且没调过工具 → 强制注入 tool_call
+                    if self._tool_call_count == 0 and turn == 0:
+                        yield json.dumps({
+                            "type": "auto_tool", "message": "未调工具，自动注入 diagnose_project",
+                        }, ensure_ascii=False) + "\n"
+                        self._msgs.append({
+                            "role": "assistant",
+                            "content": "已调用 diagnose_project",
+                        })
+                        self._msgs.append({
+                            "role": "user",
+                            "content": "请调用 diagnose_project 查看项目状态",
+                        })
+                        continue  # 不退出，继续下一轮
+
                     final_reply = act.get("message", "")
                     yield json.dumps({
                         "type": "reply", "message": final_reply,