Load model context from a bounded rollout suffix - #32896
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## Why Reconstructing the latest model-visible context does not require replaying an entire paginated rollout when a usable compaction checkpoint and the associated completed-turn metadata are available. ## What changed - Add `ThreadStore::load_latest_model_context` and `StoredModelContext` for loading replay-ready model context independently of full thread history. - Reverse-scan plain paginated JSONL rollouts until the newest safe bounded suffix is found, while preserving canonical session metadata and chronological replay order. - Fall back to complete history for legacy or compressed rollouts and whenever compaction or rollback records make a bounded cutoff unsafe. ## Testing - Cover checkpoint selection, turn-metadata boundaries, agent messages, contextual user fragments, and full-history fallbacks. GitOrigin-RevId: 3572f4ecc7aa4099a6d9f0d3e72d0ef432cd9497
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Load model context from a bounded rollout suffix
Why
Reconstructing the latest model-visible context does not require replaying an
entire paginated rollout when a usable compaction checkpoint and the associated
completed-turn metadata are available.
What changed
ThreadStore::load_latest_model_contextandStoredModelContextforloading replay-ready model context independently of full thread history.
suffix is found, while preserving canonical session metadata and chronological
replay order.
compaction or rollback records make a bounded cutoff unsafe.
Testing
contextual user fragments, and full-history fallbacks.