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## Why App-server clients need a way to update a thread's next-turn settings without starting a turn, adding transcript content, or waiting for turn lifecycle events. This gives settings UI a direct path for durable thread settings while clients observe the eventual effective state through a notification. This is a simplified rework of PR https://github.com/openai/codex/pull/22509. In particular, it changes the `thread/settings/update` api to return immediately rather than waiting and returning the effective (updated) thread settings. This makes the new api consistent with `turn/start` and greatly reduces the complexity of the implementation relative to the earlier attempt. ## What Changed - Adds experimental `thread/settings/update` with partial-update request fields and an empty acknowledgment response. - Adds experimental `thread/settings/updated`, carrying full effective `ThreadSettings` and scoped by `threadId` to subscribed clients for the affected thread. - Shares durable settings validation with `turn/start`, including `sandboxPolicy` plus `permissions` rejection and `serviceTier: null` clearing. - Emits the same settings notification when `turn/start` overrides change the stored effective thread settings. - Regenerates app-server protocol schema fixtures and updates `app-server/README.md`.