(realtime capabilities): add support for native transcript synchronization

[tinalenguyen]

No description provided.

[changeset-bot]

🦋 Changeset detected

Latest commit: 985a136

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 28 packages

Name	Type
@livekit/agents-plugin-phonic	Patch
@livekit/agents	Patch
@livekit/agents-plugin-anam	Patch
@livekit/agents-plugin-assemblyai	Patch
@livekit/agents-plugin-baseten	Patch
@livekit/agents-plugin-bey	Patch
@livekit/agents-plugin-cartesia	Patch
@livekit/agents-plugin-cerebras	Patch
@livekit/agents-plugin-deepgram	Patch
@livekit/agents-plugin-elevenlabs	Patch
@livekit/agents-plugin-google	Patch
@livekit/agents-plugin-hedra	Patch
@livekit/agents-plugin-inworld	Patch
@livekit/agents-plugin-lemonslice	Patch
@livekit/agents-plugin-liveavatar	Patch
@livekit/agents-plugin-livekit	Patch
@livekit/agents-plugin-minimax	Patch
@livekit/agents-plugin-mistral	Patch
@livekit/agents-plugin-neuphonic	Patch
@livekit/agents-plugin-openai	Patch
@livekit/agents-plugin-resemble	Patch
@livekit/agents-plugin-rime	Patch
@livekit/agents-plugin-runway	Patch
@livekit/agents-plugin-sarvam	Patch
@livekit/agents-plugin-silero	Patch
@livekit/agents-plugins-test	Patch
@livekit/agents-plugin-trugen	Patch
@livekit/agents-plugin-xai	Patch

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[devin-ai-integration]

Devin Review found 1 new potential issue.

View 25 additional findings in Devin Review.

[devin-ai-integration]

🟡 TranscriptionSynchronizer.enabled setter treats undefined and false as different, causing unnecessary segment rotation

When the TranscriptionSynchronizer is constructed without native sync (the default), this.options.enabled is undefined. When onConversationItemAdded fires for an agent handoff to another non-native-sync model, this.transcriptionSynchronizer.enabled = false is called (room_io/room_io.ts:286). The setter at line 547 compares this.options.enabled === value → undefined === false → false, so it falls through and triggers a rotateSegment(). This rotation closes the current SegmentSynchronizerImpl (which force-closes the word stream at synchronizer.ts:476) and creates a new one with identical sync behavior (!false = true is functionally equivalent to !undefined = true). If the rotation interrupts an active synchronization segment (text buffered in the word stream but not yet forwarded), words can be silently dropped.

Suggested change

	if (this.options.enabled === value) {
	return;
	if (!!this.options.enabled === value) {

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