Load bounded context after empty wake turns - #41901
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## Why Paginated threads can accumulate wake turns with no user-message boundary. The reverse context scan could not use those turns as a bounded replay cutoff, even when a compaction and its resume state provided everything needed to reconstruct the latest model context. ## What changed Treat a full world-state snapshot that survives the latest compaction as a durable baseline when it is paired with a compatible turn context. This lets the scan stop at empty wake turns while still scanning further back for patches, snapshots before compaction, or missing and mismatched turn contexts. ## Testing Add coverage for repeated empty wake turns and verify that bounded replay matches full rollout reconstruction across successive compaction windows. GitOrigin-RevId: ae90c5f939c660ea539fbfc11128cc7259efaa9c
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Load bounded context after empty wake turns
Why
Paginated threads can accumulate wake turns with no user-message boundary. The
reverse context scan could not use those turns as a bounded replay cutoff, even
when a compaction and its resume state provided everything needed to reconstruct
the latest model context.
What changed
Treat a full world-state snapshot that survives the latest compaction as a
durable baseline when it is paired with a compatible turn context. This lets the
scan stop at empty wake turns while still scanning further back for patches,
snapshots before compaction, or missing and mismatched turn contexts.
Testing
Add coverage for repeated empty wake turns and verify that bounded replay
matches full rollout reconstruction across successive compaction windows.