- Flush inbound debouncers BEFORE markGatewayDraining() so flushed
messages can still enqueue into the command queue (CWE-672)
- Reorder restart drain: flush debouncers -> active tasks -> followup
queues (followups need active turns to finish before they can drain)
- Always drain followup queues regardless of flushed debouncer count
- Only deregister debouncer handles after all buffers confirmed drained;
keep partially-flushed handles for subsequent sweeps
- Wrap flushAll with deadline-based timeout (Promise.race) to prevent
hung provider calls from blocking restart indefinitely
- Unregister MSTeams debouncer on startup failure (EADDRINUSE etc)
- Update test expectations for new drain ordering
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