Use symmetric spawn-then-run() pattern in multi-task examples

Switch every example to ``await runner.spawn(task)`` followed by
``await runner.run()`` (no task argument), and ``await runner.cancel()``
on client-disconnected instead of ``await task.cancel()``. This makes
the main pipeline task look the same as the worker / proxy tasks
spawned alongside it, and lets ``runner.cancel()`` drive a uniform
shutdown across every root task on the bus.

examples/multi-task/code-assistant/code-assistant.py

@@ -145,8 +145,6 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
         idle_timeout_secs=runner_args.pipeline_idle_timeout_secs,
     )
 
-    await runner.spawn(CodeWorker("code_worker", project_path=PROJECT_PATH))
-
     @transport.event_handler("on_client_connected")
     async def on_client_connected(transport, client):
         logger.info("Client connected")
@@ -161,9 +159,12 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
     @transport.event_handler("on_client_disconnected")
     async def on_client_disconnected(transport, client):
         logger.info("Client disconnected")
-        await task.cancel()
+        await runner.cancel()
 
-    await runner.run(task)
+    await runner.spawn(CodeWorker("code_worker", project_path=PROJECT_PATH))
+    await runner.spawn(task)
+
+    await runner.run()
 
 
 async def bot(runner_args: RunnerArguments):

examples/multi-task/local-handoff/local-handoff-two-agents-tts.py

@@ -227,9 +227,6 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
         idle_timeout_secs=runner_args.pipeline_idle_timeout_secs,
     )
 
-    await runner.spawn(_build_greeter())
-    await runner.spawn(_build_support())
-
     @transport.event_handler("on_client_connected")
     async def on_client_connected(transport, client):
         logger.info("Client connected")
@@ -251,9 +248,13 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
     @transport.event_handler("on_client_disconnected")
     async def on_client_disconnected(transport, client):
         logger.info("Client disconnected")
-        await task.cancel()
+        await runner.cancel()
 
-    await runner.run(task)
+    await runner.spawn(_build_greeter())
+    await runner.spawn(_build_support())
+    await runner.spawn(task)
+
+    await runner.run()
 
 
 async def bot(runner_args: RunnerArguments):

examples/multi-task/local-handoff/local-handoff-two-agents.py

@@ -200,11 +200,6 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
         idle_timeout_secs=runner_args.pipeline_idle_timeout_secs,
     )
 
-    # Spawn the child LLM tasks. ``bridged=()`` on each child auto-wraps
-    # its pipeline with bus edges, so no extra wiring is needed here.
-    await runner.spawn(_build_greeter())
-    await runner.spawn(_build_support())
-
     @transport.event_handler("on_client_connected")
     async def on_client_connected(transport, client):
         logger.info("Client connected")
@@ -226,9 +221,13 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
     @transport.event_handler("on_client_disconnected")
     async def on_client_disconnected(transport, client):
         logger.info("Client disconnected")
-        await task.cancel()
+        await runner.cancel()
 
-    await runner.run(task)
+    await runner.spawn(_build_greeter())
+    await runner.spawn(_build_support())
+    await runner.spawn(task)
+
+    await runner.run()
 
 
 async def bot(runner_args: RunnerArguments):

examples/multi-task/parallel-debate/parallel-debate.py

@@ -198,9 +198,6 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
         idle_timeout_secs=runner_args.pipeline_idle_timeout_secs,
     )
 
-    for role in ROLE_PROMPTS:
-        await runner.spawn(DebateWorker(role))
-
     @transport.event_handler("on_client_connected")
     async def on_client_connected(transport, client):
         logger.info("Client connected")
@@ -218,9 +215,13 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
     @transport.event_handler("on_client_disconnected")
     async def on_client_disconnected(transport, client):
         logger.info("Client disconnected")
-        await task.cancel()
+        await runner.cancel()
 
-    await runner.run(task)
+    for role in ROLE_PROMPTS:
+        await runner.spawn(DebateWorker(role))
+    await runner.spawn(task)
+
+    await runner.run()
 
 
 async def bot(runner_args: RunnerArguments):

examples/multi-task/remote-proxy-assistant/assistant.py

@@ -104,8 +104,10 @@ async def websocket_endpoint(websocket: WebSocket):
     assistant = AcmeAssistant()
 
     await runner.spawn(proxy)
+    await runner.spawn(assistant)
+
     logger.info("Assistant server ready, waiting for activation")
-    await runner.run(assistant)
+    await runner.run()
     logger.info("Assistant server session ended")
 
 

examples/multi-task/remote-proxy-assistant/main.py

@@ -116,7 +116,6 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
         remote_task_name="assistant",
         forward_messages=(BusFrameMessage,),
     )
-    await runner.spawn(proxy)
 
     async def on_assistant_ready(_data: TaskReadyData) -> None:
         logger.info("Remote assistant ready, activating")
@@ -145,9 +144,12 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
     @transport.event_handler("on_client_disconnected")
     async def on_client_disconnected(transport, client):
         logger.info("Client disconnected")
-        await task.cancel()
+        await runner.cancel()
 
-    await runner.run(task)
+    await runner.spawn(proxy)
+    await runner.spawn(task)
+
+    await runner.run()
 
 
 async def bot(runner_args: RunnerArguments):