fix(inference): don't leak mock participant sid into request headers

[rosetta-livekit-bot]

Problem

Running an agent in console mode crashes on startup as soon as STT connects:

TypeError: Cannot serialize non-str key <MagicMock name='mock.local_participant.sid'>
ERROR  AgentSession is closing due to unrecoverable error

This is a regression from #5937 (agent ID header). That change made get_inference_headers() read ctx.agent.sid — which is room.local_participant.sid. In console mode the room comes from create_mock_room(), where local_participant is an autospec mock and .sid was never assigned, so it stayed a truthy MagicMock. The mock passed the truthy check, got added as the X-LiveKit-Agent-ID header value, and aiohttp then failed to serialize it during the WebSocket handshake — taking down STT and the whole session.

Fix

• ipc/mock_room.py: pin local_participant.sid = "" and identity = "agent" to real strings, matching how the remote participant already sets .sid.
• inference/_utils.py: harden get_inference_headers() to only emit non-empty str values for room/job/agent IDs, so no mock or test context can inject a non-serializable header again.

Testing

Verified console mode starts and STT connects. Confirmed the mock room now returns a string sid ("", falsy → header omitted, matching the docstring's "omitted in console mode or tests").

🤖 Generated with Claude Code

[changeset-bot]

🦋 Changeset detected

Latest commit: a966084

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

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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 1 additional finding.

[toubatbrian]

also a python-specific one