fix(agents): preserve transcription item id

[rosetta-livekit-bot]

Summary

• add itemId to user input transcription events
• preserve realtime transcription item IDs when emitting UserInputTranscribedEvent
• port the focused regression test from fix: preserve transcription item id agents#6120

Testing

• pnpm --filter @livekit/agents build:types
• pnpm test agents/src/voice/agent_activity.test.ts
• pnpm exec eslint -f unix agents/src/voice/agent_activity.test.ts
• pnpm exec prettier --check agents/src/voice/events.ts agents/src/voice/agent_activity.ts agents/src/voice/agent_activity.test.ts .changeset/preserve-transcription-item-id.md

---

Ported from livekit/agents#6120

Original PR description

Fixes #6109

Summary

• expose item_id on UserInputTranscribedEvent
• pass through realtime input transcription item IDs when re-emitting user transcription events
• add a regression test for item ID propagation

Testing

• uv run pytest tests/test_agent_session.py -q
• uv run pytest tests/test_agent_session.py::test_realtime_user_input_transcription_preserves_item_id -q
• uv run ruff check livekit-agents/livekit/agents/voice/events.py livekit-agents/livekit/agents/voice/agent_activity.py tests/test_agent_session.py

[changeset-bot]

🦋 Changeset detected

Latest commit: 51f3112

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

This PR includes changesets to release 35 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-did	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

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[devin-ai-integration]

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[devin-ai-integration]

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