Fix ElevenLabs websocket context id handling

[rosetta-livekit-bot]

Summary

Fix ElevenLabs multi-context websocket handling so the TTS plugin accepts both contextId and context_id response fields.

ElevenLabs' multi-context websocket API uses snake_case context_id in client messages, and current websocket responses can also include context_id. The plugin only reads camelCase contextId, so valid audio/final messages can be treated as unexpected messages when the response uses snake_case. In LiveKit fallback setups, this can cause ElevenLabs audio to be skipped and a fallback TTS provider to be used instead.

This change keeps existing contextId handling, adds context_id compatibility, and treats flush_done messages for inactive contexts as harmless lifecycle messages.

Tests

uv run ruff format livekit-plugins/livekit-plugins-elevenlabs/livekit/plugins/elevenlabs/tts.py tests/test_plugin_elevenlabs_tts.py
uv run ruff check livekit-plugins/livekit-plugins-elevenlabs/livekit/plugins/elevenlabs/tts.py tests/test_plugin_elevenlabs_tts.py
uv run pytest tests/test_plugin_elevenlabs_tts.py

Result:

10 passed

[changeset-bot]

🦋 Changeset detected

Latest commit: c6666f0

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

This PR includes changesets to release 33 packages

Name	Type
@livekit/agents-plugin-elevenlabs	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-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-tavus	Patch
@livekit/agents-plugin-trugen	Patch
@livekit/agents-plugin-xai	Patch
@livekit/agents-plugins-test	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.

View in Devin Review to see 2 additional findings.