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* feat: detect stale Slack sockets and auto-restart
Slack Socket Mode connections can silently stop delivering events while
still appearing connected (health checks pass, WebSocket stays open).
This "half-dead socket" problem causes messages to go unanswered.
This commit adds two layers of protection:
1. **Event liveness tracking**: Every inbound Slack event (messages,
reactions, member joins/leaves, channel events, pins) now calls
`setStatus({ lastEventAt, lastInboundAt })` to update the channel
account snapshot with the timestamp of the last received event.
2. **Health monitor stale socket detection**: The channel health monitor
now checks `lastEventAt` against a configurable threshold (default
30 minutes). If a channel has been running longer than the threshold
and hasn't received any events in that window, it is flagged as
unhealthy and automatically restarted — the same way disconnected
or crashed channels are already handled.
The restart reason is logged as "stale-socket" for observability, and
the existing cooldown/rate-limit logic (3 restarts/hour max) prevents
restart storms.
* Slack: gate liveness tracking to accepted events
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Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>