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Preserve item timestamps in thread history projections - #35689
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## What changed - Add optional start and completion timestamps to `ThreadHistoryItemChange`. - Populate them from canonical `ItemCompleted` records during stateless thread history projection. - Treat a zero completion timestamp as absent, and leave timestamps unset for legacy builder events that do not provide them. ## Testing - Cover projected item timestamps, including missing start times and zero completion times. GitOrigin-RevId: 2187530f489ad3d86b6ab65faaaab1eab5357f1b
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Preserve item timestamps in thread history projections
What changed
ThreadHistoryItemChange.ItemCompletedrecords during stateless thread history projection.Testing