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## What changed - Add a feature-gated `TurnSettings` operation that can update the model, reasoning effort, reasoning summary, and service tier for subsequent steps of a named running turn without changing future thread settings. - Report whether an update was applied, rejected, or lost its live target. - Revalidate managed constraints and preserve the turn's admitted approval and Guardian safety properties before publishing an updated settings snapshot. ## Testing - Cover sparse updates, step capture and ordering, target replacement, managed policy changes, model metadata safety, and separation from future settings. GitOrigin-RevId: ecaaaa95b4fd4ec9d62265bef551582dddb36d78