Persist response token usage in rollout history - #41912
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## Why Resumed threads need to continue per-turn and per-thread token totals without scanning arbitrarily far beyond the latest compaction checkpoint. ## What changed - Add durable `TokenUsageRecord` rollout items with response, turn, thread, session, and root-turn attribution. - Restore accumulated usage on resume and snapshot the latest record plus the compaction response ID in compaction checkpoints. - Preserve root-turn lineage in persisted turn context, while ensuring forked child threads start with their own usage totals. ## Testing - Cover usage accumulation across multiple responses and resumed turns. - Cover local and remote compaction checkpoints, invalid remote compaction output, rollout reconstruction, and fork isolation. GitOrigin-RevId: ef9e0c4a9102a08a2c382be4cdac68c84353c90a
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Persist response token usage in rollout history
Why
Resumed threads need to continue per-turn and per-thread token totals without scanning arbitrarily far beyond the latest compaction checkpoint.
What changed
TokenUsageRecordrollout items with response, turn, thread, session, and root-turn attribution.Testing