827fb52f5f65f606db27864a868b06a517279e48
openThread (create-or-join), send (idempotent, bumps other participants' unread, message.sent outbox event, traceId DB->event), markRead (READ receipt + unread reset), contentRef attachment placeholder. Adds messageSent to contracts events. 5 DB-backed tests green; 24 total. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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