Add the configuration surface to drive a realtime service like Gemini
Live from local turn detection without paying user-transcript latency.
Cascaded pipelines wait for a transcript before ending the user's turn
because the downstream LLM needs the user's words recorded in context
— but that wait is pure latency in pipelines using local turn
detection to drive a realtime service, which consumes user audio
directly.
Set `wait_for_transcript_to_end_user_turn=False` on
`LLMUserAggregatorParams` to turn this on. With that single flag the
aggregator:
- drops `TranscriptionUserTurnStartStrategy` from the start strategies
(so late-arriving realtime transcripts don't trigger new turns),
- sets `wait_for_transcript=False` on any stop strategy that supports
it (so the turn ends on the audible end of the turn, without
waiting for a transcript),
- fires `on_user_turn_stopped` on the audible end of the turn with
empty `content` (since the transcript hasn't arrived), and
- defers the context flush until the transcript arrives or a backstop
timer fires.
A new `on_user_turn_message_finalized` event fires when the user's
message has been written to context. In the default mode it
coincides with `on_user_turn_stopped`; in the delayed-transcript mode
it fires later. Consumers that want the populated transcript should
subscribe to `on_user_turn_message_finalized` — it's the event that
always carries the user message, regardless of mode.
Strategy mutations are logged: loudly when the user passed their own
strategies (we're overwriting parts of their config), quietly
otherwise. The strategy-level `wait_for_transcript` parameter on
`TurnAnalyzerUserTurnStopStrategy` and `SpeechTimeoutUserTurnStopStrategy`
remains exposed for advanced cases.
The example `realtime-gemini-live-local-vad.py` demonstrates the full
pattern.
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