OptionalReasoningReasoning plane settings — dual delegation configuration. Absent defaults to 'local'.
OptionalTurnCatalog-level turn-detection default for this model. Folded into the realtime session Config
bag as the turnDetection key BELOW the agent/app config cascade
(realtime.session.turnDetection) and the runtime override — the catalog supplies the
default, agents/apps/callers refine it.
Realtime (speech-to-speech) knobs.