fix(voice): prevent RecorderIO shutdown write-loop noise

[toubatbrian]

Summary

• Hardened RecorderIO shutdown to prevent repeated writes during teardown:
  • Set a shutdown fence (closing) and stop writes immediately when close starts
  • Cancel forwardTask before closing channels
  • Exit forward loop on closed-stream/channel conditions
• Centralized isWritableStreamClosedError() into agents/src/utils.ts for reuse
• Added focused regression tests for writable-stream closed error detection in:
  • agents/src/voice/recorder_io/recorder_io.test.ts

Why

On disconnect, recorder background writes could race with stream closure and emit repeated
Invalid state: WritableStream is closed errors. This change makes post-close writes structurally
impossible and treats teardown-expected closure as terminal, removing log spam.

Test Plan

• pnpm test agents/src/voice/recorder_io/recorder_io.test.ts
• Manual verification with multiple back-to-back session disconnects:
  • Confirm no repeated Error writing RecorderIO output buffer logs after disconnect

[changeset-bot]

🦋 Changeset detected

Latest commit: ff7b80f

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	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-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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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Restrict closed-stream detection to closure-specific cases

isWritableStreamClosedError() currently returns true for any error with code === 'ERR_INVALID_STATE', but that code is also used for non-closure stream-state failures; when this happens, RecorderIO.forward() will treat a real stream bug as expected teardown and break the loop without surfacing it. This can silently stop recording progress and hide actionable errors, so the predicate should also verify the message (or otherwise positively identify closed-stream conditions) before suppressing/log-skipping.

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[devin-ai-integration]

Devin Review found 1 potential issue.

View 4 additional findings in Devin Review.