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## Why `turn/start` already accepts an input array on the wire, including an empty array, but core treated empty input as a no-op before the turn could reach the model. App-server clients need to be able to start a real turn even when there is no new user message, for example to let the model proceed from existing thread context. ## What changed - Removed the `run_turn` early return that skipped empty-input turns when there was no pending input. - Kept empty active-turn steering rejected by moving the `steer_input` empty-input check until after core has determined whether there is an active regular turn. - Empty regular turns now refresh `previous_turn_settings` like other regular turns, so follow-up context injection state advances consistently. - Added an app-server v2 integration test proving `turn/start` with `input: []` emits started/completed notifications, sends one Responses request, and does not synthesize an empty user message. ## Validation - `cargo test -p codex-app-server --test all turn_start_with_empty_input_runs_model_request`