fix(voice): await initRecording() to prevent OTEL trace loss in short sessions

[moyounishimself]

Summary

ctx.initRecording() in AgentSession.start() is called without await, creating a race condition where the OTLP exporter may not be connected before session events fire. This causes intermittent "No observability data available" in Agent Insights — particularly for short sessions without tool calls, where the session ends before the cloud tracer finishes initializing.

Sessions with tool calls (which take longer due to API round-trips) give the tracer enough time to connect, masking the issue. The session report uploads successfully in all cases, but OTEL traces carrying transcripts and audio metadata are lost.

Changes

• Await ctx.initRecording() in AgentSession.start() so the cloud tracer is ready before any events fire

Test plan

• Deployed with a manual workaround (await ctx.initRecording() before session.start()) on LiveKit Cloud — Agent Insights data now records consistently for short sessions without tool calls
• Verified no regression for sessions with tool calls

[changeset-bot]

🦋 Changeset detected

Latest commit: 81c453a

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

This PR includes changesets to release 26 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-google	Patch
@livekit/agents-plugin-hedra	Patch
@livekit/agents-plugin-inworld	Patch
@livekit/agents-plugin-lemonslice	Patch
@livekit/agents-plugin-livekit	Patch
@livekit/agents-plugin-mistral	Patch
@livekit/agents-plugin-neuphonic	Patch
@livekit/agents-plugin-openai	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-plugins-test	Patch
@livekit/agents-plugin-trugen	Patch
@livekit/agents-plugin-xai	Patch

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[devin-ai-integration]

✅ Devin Review: No Issues Found

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

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