fix: relay confirmation interrupts past muted input

backend/services/brains/base.py

@@ -95,7 +95,6 @@ class BrainRuntime:
     set_vision_scope: Callable[[dict[str, Any]], None] | None = None
     vision_function: Any = None
     set_input_enabled: Callable[[bool], None] | None = None
-    wait_for_output_stopped: Callable[[], Awaitable[None]] | None = None
     apply_turn_config: (
         Callable[[bool, dict[str, Any]], Awaitable[None]] | None
     ) = None

backend/services/brains/workflow_brain.py

@@ -1093,16 +1093,6 @@ class WorkflowBrain(BaseBrain):
             ),
         )
         if result.succeeded:
-            if (
-                completion_policy == MESSAGE_CONFIRMATION
-                and result.action == "confirmed"
-            ):
-                if runtime.wait_for_output_stopped is None:
-                    raise RuntimeError("当前管线不支持等待 Message 确认语音停止")
-                # ClientToolBroker has already broadcast the interruption
-                # before resolving the confirmation. Keep the next node behind
-                # the pipeline and transport playback boundaries.
-                await runtime.wait_for_output_stopped()
             await self._emit_trace(
                 "message_completed",
                 nodeId=node_id,