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* fix(channels): keep blocking SDK teardown off the event loop in stop()
SlackChannel.stop() called SocketModeClient.close() inline. close() joins
the SDK's message-processor thread (~0.7s every call, measured) and waits
for in-flight listeners, whose blocking Web API calls can run up to the
WebClient timeout, so every run, stream and channel on the Gateway stalled
during shutdown and POST /api/channels/{name}/restart.
Feishu and DingTalk had the same shape: they joined their SDK threads
inline with a 5s timeout, and since those threads only return on a fatal
error, the join normally froze the loop for the full 5s.
The teardown now runs through asyncio.to_thread. Slack detaches the client
first so a still-queued connect skips it, and shields and tracks the close
task so a cancelled stop() leaves it running and a retried stop() awaits
the same close instead of closing twice.
tests/blocking_io/test_channel_stop_offloop.py anchors all three stop()
paths to the strict Blockbuster gate, driving a real slack-sdk client.
* docs(changelog): reference #6134
* fix(channels): join the Discord client thread off the event loop in stop()
DiscordChannel.stop() still joined its client thread inline with a 10s
timeout. The thread usually exits right after the cross-loop client close,
but a timed-out close or a slow _run_client() drain keeps it alive for the
whole timeout, stalling the shared Gateway loop the same way the Slack,
Feishu and DingTalk teardown did. Run the join through asyncio.to_thread so
stop() matches the channels/AGENTS.md teardown rule, and add Discord to the
strict Blockbuster anchor.