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## Why Guardian analytics includes time-to-first-token, but the Guardian reviewer runs as a normal Codex session and `TurnCompleteEvent` did not expose TTFT. The timing needs to flow through the standard turn-completion protocol so Guardian review analytics can consume the same value as the rest of the session machinery. ## What changed Adds optional `time_to_first_token_ms` to `TurnCompleteEvent` and populates it from `TurnTiming`. The value is carried through app-server thread history, rollout reconstruction, TUI/app-server adapters, and Guardian review session handling. Guardian review analytics now captures TTFT from the reviewer turn-complete event when available. Existing tests and fixtures are updated to set the new optional field to `None` where TTFT is not relevant. ## Verification - `cargo clippy -p codex-tui --tests -- -D warnings` - `cargo clippy -p codex-core --lib --tests -- -D warnings` --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/openai/codex/pull/17696). * __->__ #17696 * #17695 * #17693 * #18278 * #18953