fix: Prevent shutdown hang when speech is active during disconnect

[toubatbrian]

Summary

• Fix AgentActivity.interrupt() to cancel all speech tasks and force-mark speech handles done when force=true, resolving the interrupt future immediately instead of waiting for tasks to complete
• Fix AgentSession._closeSoon() to assign the closeImpl promise to closingTask, preventing duplicate shutdown calls (matching Python)
• Update AgentActivity.close() to cancel remaining speech tasks before closing session resources

[changeset-bot]

🦋 Changeset detected

Latest commit: bdd1c9e

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

This PR includes changesets to release 21 packages

Name	Type
@livekit/agents	Patch
@livekit/agents-plugin-anam	Patch
@livekit/agents-plugin-baseten	Patch
@livekit/agents-plugin-bey	Patch
@livekit/agents-plugin-cartesia	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-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-sarvam	Patch
@livekit/agents-plugin-silero	Patch
@livekit/agents-plugins-test	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 4 additional findings.

[lukasIO]

@toubatbrian does this close any of the related user reports?