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Brent Traut
b6e8a2e207
## Why A stale read acknowledgement must not clear unread results published after the client’s snapshot or overwrite another read-state edit. Read state also needs to survive thread metadata rebuilds. ## What changed - Add `thread_read_receipts` and state APIs to query read state, publish thread attention, and mark threads read or unread. - Track the first unread turn and require matching revisions for explicit edits, returning the current state on conflicts. Allow manually marking even an empty thread unread. - Retain the last published turn across acknowledgements to suppress duplicate delivery. Keep receipts independent of rebuildable metadata and remove them on thread deletion. - Return initial read states without creating receipt rows. ## Testing Add tests covering stale edits, thread-specific initial revisions, repeated unread marks, duplicate publication, persistence across metadata rebuilds and restarts, clearing a reverted turn’s unread position, and deleted-thread handling. GitOrigin-RevId: fee8c05c20903b1d7aea7e8b61c9248c7f623a72