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### Motivation Exposes a per-thread / per-turn `personality` override in the v2 app-server API so clients can influence model communication style at thread/turn start. Ensures the override is passed into the session configuration resolution so it becomes effective for subsequent turns and headless runners. ### Testing - [x] Add an integration-style test `turn_start_accepts_personality_override_v2` in `codex-rs/app-server/tests/suite/v2/turn_start.rs` that verifies a `/personality` override results in a developer update message containing `<personality_spec>` in the outbound model request. ------ [Codex Task](https://chatgpt.com/codex/tasks/task_i_6971d646b1c08322a689a54d2649f3fe)