fix(voice): add transcript segment close timeout

[rosetta-livekit-bot]

Summary

• bound transcript segment close drain with a 5s timeout fallback
• keep segment rotation moving even if the previous close task fails
• add a patch changeset

Port of livekit/agents#6029.

Testing

• pnpm exec prettier --check agents/src/voice/transcription/synchronizer.ts agents/src/transcription.ts
• pnpm exec eslint agents/src/voice/transcription/synchronizer.ts
• pnpm vitest run agents/src/voice/transcription/synchronizer.test.ts
• pnpm build:agents

---

Ported from livekit/agents#6029

Original PR description

_SegmentSynchronizerImpl.aclose() awaits the forwarding/speaking-rate tasks unconditionally. If a downstream output stalls, those awaits can hang and block segment rotation from installing a fresh impl, leaving TranscriptSynchronizer._impl stuck closed.

Add a timeout fallback: if the tasks don't drain in time, warn and cancel them so rotation always completes. Also stamp each impl with an id and include it in the warning extras, so a stuck impl can be told apart from a fresh one in logs.

[changeset-bot]

🦋 Changeset detected

Latest commit: b96534c

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

This PR includes changesets to release 34 packages

Name	Type
@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-fishaudio	Patch
@livekit/agents-plugin-google	Patch
@livekit/agents-plugin-hedra	Patch
@livekit/agents-plugin-hume	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-mistralai	Patch
@livekit/agents-plugin-neuphonic	Patch
@livekit/agents-plugin-openai	Patch
@livekit/agents-plugin-perplexity	Patch
@livekit/agents-plugin-phonic	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-plugin-soniox	Patch
@livekit/agents-plugin-tavus	Patch
@livekit/agents-plugins-test	Patch
@livekit/agents-plugin-trugen	Patch
@livekit/agents-plugin-xai	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.