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**Stack position:** [5 of 7] ## Summary This PR adds `Op::ThreadSettings`, a queued settings-only update mechanism for changing stored thread settings without starting a new turn. It also removes the legacy `Op::OverrideTurnContext` in the same layer, so reviewers can see the replacement and deletion together. ## Changes - Add `Op::ThreadSettings` for settings-only queued updates. - Emit `ThreadSettingsApplied` with the effective thread settings snapshot after core applies an update. - Route settings-only updates through the same submission queue as user input. - Migrate remaining `OverrideTurnContext` tests and callers to the queued `Op::ThreadSettings` path. - Delete `Op::OverrideTurnContext` from the core protocol and submission loop. This stack addresses #20656 and #22090. ## Stack 1. [1 of 7] [Add thread settings to UserInput](https://github.com/openai/codex/pull/23080) 2. [2 of 7] [Remove UserInputWithTurnContext](https://github.com/openai/codex/pull/23081) 3. [3 of 7] [Remove UserTurn](https://github.com/openai/codex/pull/23075) 4. [4 of 7] [Placeholder for OverrideTurnContext cleanup](https://github.com/openai/codex/pull/23087) 5. [5 of 7] [Replace OverrideTurnContext with ThreadSettings](https://github.com/openai/codex/pull/22508) (this PR) 6. [6 of 7] [Add app-server thread settings API](https://github.com/openai/codex/pull/22509) 7. [7 of 7] [Sync TUI thread settings](https://github.com/openai/codex/pull/22510)