Avoid cloning thread history for token usage replay - #34361
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## What changed - Resolve the turn ID for restored token usage before sending resume and fork responses, avoiding a clone of the full thread history. - Add `ThreadHistoryBuilder::active_turn_id` so attribution can inspect the active turn without materializing its items. - Stop history reconstruction at the latest persisted `TokenCount` and verify that a later tail turn does not receive the replayed usage. GitOrigin-RevId: 69c4a9fe04770d1a938470afc933431e61670094
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Avoid cloning thread history for token usage replay
What changed
ThreadHistoryBuilder::active_turn_idso attribution can inspect the active turn without materializing its items.TokenCountand verify that a later tail turn does not receive the replayed usage.