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## What changed - Add the experimental `turn/settings/update` method for changing `model`, `effort`, `summary`, and `serviceTier` on a specific live turn without changing future turns. - Report whether the update was applied or the target turn was unavailable, and reject unsupported fields, disabled feature use, unsafe model changes, and direct updates to parent-owned subagents. - Document the method's feature requirements, null handling, and limits. ## Testing - Cover current-turn and future-turn isolation, rejected and unavailable targets, feature and capability gates, saved threads, and subagent ownership. GitOrigin-RevId: 18440f6d7ee5fcd06ae23bd41b22c492b62bb2b5