Owen Lin
ba5dd1fd3a
## Description This PR moves hook prompts onto the canonical `TurnItem` lifecycle in core. Stop hooks now record their `ResponseItem` through the existing lifecycle path, which emits `ItemStarted` and `ItemCompleted`. App-server consumes those events directly instead of deriving a hook prompt from `RawResponseItem`. ## Why Hook prompts were the only `ThreadItem` app-server synthesized from `RawResponseItem`. This brings them in line with other core-owned turn items while preserving legacy rollout replay. ## What changed - Route stop-hook prompts through `record_response_item_and_emit_turn_item`. - Materialize canonical hook prompts in `ThreadHistoryBuilder`. - Remove `RawResponseItem` to `ThreadItem` synthesis while preserving legacy rollout replay. - Add focused coverage for lifecycle emission and canonical and legacy history materialization.
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