fix(voice): restrict stt pipeline reuse

[rosetta-livekit-bot]

Summary

On agent handoff, _detach_reusable_resources reuses the STT pipeline when type(self.agent).stt_node is type(new_activity.agent).stt_node. That check passes whenever two agents share the same stt_node method object — including via a common base class — but the detached pipeline is a running generator bound to the old agent's self. The default Agent.stt_node is safe because it only reads self/activity at startup, before the yield loop. Any custom override that touches self.session or self.activity inside the loop will crash after handoff:

File "/code/ai_receptionist/logic/livekit_agents/base.py", line 1079, in stt_node
    self.session,
File ".../voice/agent.py", line 684, in session
    return self._get_activity_or_raise().session
File ".../voice/agent.py", line 382, in _get_activity_or_raise
    raise RuntimeError("no activity context found, the agent is not running")

Tighten the precondition to "both agents use Agent.stt_node directly." Custom overrides — even ones shared via inheritance — no longer trigger reuse, since we can't verify they're safe to keep iterating after their bound self loses its activity.

[changeset-bot]

🦋 Changeset detected

Latest commit: f7bbebf

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	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-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 2 additional findings.