When send_message tool is called from inside a running gateway, the
_run_async bridge spawns a worker thread with a separate event loop.
send_weixin_direct then reuses the live adapter's aiohttp session
which was created on the gateway's main loop. aiohttp's TimerContext
checks asyncio.current_task(loop=session._loop) and sees None because
we're executing on the worker thread's loop → raises 'Timeout context
manager should be used inside a task'.
Fix: skip the live-adapter shortcut when the session belongs to a
different event loop, falling through to the fresh-session path.
a22465e07a