Support incremental replay of updated thread items#35013
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## Why Persisted item snapshots can be updated after their initial projection while retaining their creation order. Callers need a way to read those updates incrementally without replaying every item. ## What changed - Track the rollout ordinal of each item's latest snapshot separately from its creation ordinal. - Let thread-store callers filter items after an exclusive update watermark and sort pages by either creation or update ordinal. - Keep existing app-server reads creation-ordered, reject incremental reads across forked lineages, and preserve compatibility with older writers. ## Testing - Cover update-watermark filtering, pagination, sort directions, per-turn reads, cursor validation, forked lineages, migration compatibility, and refreshed item snapshots. GitOrigin-RevId: d57de849abec27f788e9c384dbff073a0aca1053
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Support incremental replay of updated thread items
Why
Persisted item snapshots can be updated after their initial projection while retaining their creation order. Callers need a way to read those updates incrementally without replaying every item.
What changed
Testing