fix: repair syntax and corruption in api/agent_task_routes.py

api/agent_task_routes.py

@@ -792,3 +792,5 @@ async def stream_agent_task(task_id: str, request: Request, resume: int = 0):
         headers={
             'Cache-Control':     'no-cache',
             'X-Accel-Buffering': 'no',
+        }
+    )