feat(realtime): announce speakers in transcription-only sessions
With voice_recognition.identity.announce on, a realtime session sends
a conversation.item.speaker event for each user turn. Only
generateResponse sent this event. A transcription-only session never
calls generateResponse, so it resolved the speaker of each turn and
then dropped the result.
In a transcription-only session with announce on, send the event
before the completed transcription event of the turn, with the same
item_id. The rules are the same as on the response path: no event for
an unknown speaker unless announce_unknown is set, and no event for a
speaker that an enforcing gate rejects.
Sessions with announce off and response sessions do not change.
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
Co-authored-by: Ettore Di Giacinto <mudler@localai.io>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
