Route realtime V3 handoffs by response channel - #33903
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## What changed - Add `codexResponseHandoffMode` to `thread/realtime/start` for V3 sessions, with `thinking` as the default and `commentary` and `bemTags` routing modes. - Map BEM `analysis` and `commentary` output to the commentary channel and `final` output to the speakable channel, while preserving the original BEM envelope. Unrecognized output falls back to speakable. - Mark explicit speech appends as speakable and stop adding the legacy `"Agent Final Message"` prefix to V3 handoffs. V1 and V2 continue to ignore the new setting. ## Testing - Cover channel selection for every routing mode, streamed BEM header parsing, fallback behavior, explicit speech, and V1 compatibility. GitOrigin-RevId: 1974578257488f2914b252c9c1990ba38831c96b
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Route realtime V3 handoffs by response channel
What changed
codexResponseHandoffModetothread/realtime/startfor V3 sessions, withthinkingas the default andcommentaryandbemTagsrouting modes.analysisandcommentaryoutput to the commentary channel andfinaloutput to the speakable channel, while preserving the original BEM envelope. Unrecognized output falls back to speakable."Agent Final Message"prefix to V3 handoffs. V1 and V2 continue to ignore the new setting.Testing