Owen Lin 592467fb96 Load model context from a bounded rollout suffix (#32896) ...

## 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

2026-07-13 23:29:59 +00:00

..

src

Load model context from a bounded rollout suffix (#32896)

2026-07-13 23:29:59 +00:00

BUILD.bazel

Extract rollout into its own crate (#15548)

2026-03-24 18:10:53 -07:00

Cargo.toml

Support thread-level originator overrides (#29477)

2026-06-23 17:23:38 -07:00