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### Motivation - Persist richer per-turn configuration in rollouts so resumed/forked sessions and tooling can reason about the exact instruction inputs and output constraints used for a turn. ### Description - Extend `TurnContextItem` to include optional `base_instructions`, `user_instructions`, and `developer_instructions`. - Record the optional `final_output_json_schema` associated with a turn. - Add an optional `truncation_policy` to `TurnContextItem` and populate it when writing turn-context rollout items. - Introduce a protocol-level `TruncationPolicy` representation and convert from core truncation policy when recording. ### Testing - `cargo test -p codex-protocol` (pass)