fix(weixin): avoid cross-loop aiohttp session reuse in send_weixin_direct

[betterMax]

Bug

When the gateway is running, send_message tool calls to Weixin always fail with:

RuntimeError: Timeout context manager should be used inside a task

This affects both text and media delivery. Normal gateway replies work fine.

Root Cause

_run_async() (called by send_message_tool) detects a running event loop and spins up a new thread with asyncio.run(), creating a fresh event loop. However, send_weixin_direct() path A reuses the _LIVE_ADAPTERS aiohttp session, which is bound to the gateway's event loop. aiohttp raises RuntimeError when a session is used from a different loop than the one it was created on.

This explains the intermittent behavior:

• ✅ Gateway normal replies → same loop → works
• ❌ send_message tool → cross-loop conflict → fails
• ✅ Gateway not running → CLI path, no cross-loop → works

Fix

Add a loop compatibility check before reusing the live adapter session. When loops differ, fall through to path B which creates a temporary session on the current loop.

current_loop = asyncio.get_running_loop()
session_loop = getattr(send_session, '_loop', None)
loop_compatible = session_loop is None or session_loop is current_loop
if live_adapter is not None and send_session is not None and not send_session.closed and loop_compatible:

Testing

File Type	Size	Result
.png image	400KB	✅
.md document	2KB	✅
.zip archive	652KB	✅
.pdf document	552KB	✅
Binary	1MB	✅
Binary	5MB	✅

[alt-glitch]

Duplicate of #12810 — the authoritative fix was already merged as #19141. At least 10 prior PRs addressed this same cross-event-loop aiohttp session reuse in send_weixin_direct(). See also #13520, #14384, #14481, #14873, #15911, #28835.

[teknium1]

Thanks for the focused cross-loop fix. This is already implemented on current main.

• Automated hermes-sweeper review verified gateway/platforms/weixin.py:2307-2336: live adapter reuse requires send_session._loop is asyncio.get_running_loop(), and a mismatch falls through to a new aiohttp.ClientSession.
• The same fix landed in a22465e07ab4b71019f711e7a6463f6590c50742 (fix(weixin): send_weixin_direct cross-loop session check) via merged PR fix(weixin): send_weixin_direct cross-loop session check #19141.
• The merged commit is included in release v2026.5.7.
• This matches the duplicate assessment already noted by @alt-glitch.

Closing as implemented on main.