Two bugs:
1. RecentMessagesSince had msg_id IS NOT NULL filter — messages sent
before EXT-007 deployment all have msg_id=NULL so nothing was returned.
Removed the filter; mid-based INSERT OR IGNORE dedup is sufficient.
2. queryMessages didn't SELECT room, so gossipped messages had empty room
field. Added room to SELECT and Scan in queryMessages.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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