Summary

• record the Weixin adapter's owning asyncio event loop when it connects
• route live-adapter direct sends back onto that adapter loop instead of using its aiohttp session from the caller loop
• add regression coverage for cron/send_message direct sends from a different loop

Why this is needed

send_weixin_direct() is used by one-shot delivery paths such as send_message and cron delivery. When a live Weixin adapter is available, it reuses that adapter so outbound delivery can keep the adapter's context-token and media behavior.

The live adapter's _send_session is an aiohttp.ClientSession created during WeixinAdapter.connect(), so it belongs to the gateway adapter's asyncio event loop. Cron/tool delivery can call send_weixin_direct() from a different worker thread/event loop. Before this change, that path directly awaited live_adapter.send(...) from the caller loop, which can use the live adapter's aiohttp session on the wrong loop.

That cross-loop aiohttp session access can fail with event-loop/task errors such as:

Timeout context manager should be used inside a task

In practice, this can make a scheduled job complete successfully but fail when delivering the result to Weixin.

Implementation details

This PR stores the adapter's loop at connect time:

self._loop = asyncio.get_running_loop()

Then, when send_weixin_direct() finds a live adapter with an open send session:

• if the caller is already on the adapter loop, it sends directly as before
• if the caller is on another loop, it schedules the send coroutine onto the adapter loop with asyncio.run_coroutine_threadsafe(...) and awaits the wrapped future
• if there is no usable live adapter loop, the existing standalone one-shot session fallback remains available

This preserves live adapter reuse while avoiding cross-loop use of the adapter's aiohttp.ClientSession.

Test Plan

• /home/tonyxu/.hermes/hermes-agent/venv/bin/python -m pytest tests/gateway/test_weixin.py::TestWeixinSendMessageIntegration::test_send_weixin_direct_schedules_live_adapter_send_on_adapter_loop tests/gateway/test_weixin.py::TestWeixinSendMessageIntegration::test_send_to_platform_routes_weixin_media_to_native_helper -q -o 'addopts='
• /home/tonyxu/.hermes/hermes-agent/venv/bin/python -m pytest tests/gateway/test_weixin.py -q -o 'addopts='

Results:

• targeted tests: 2 passed, 2 warnings
• full Weixin adapter test file: 50 passed, 2 warnings