Added deepgram flux plugin

[KrishnaShuk]

Description

Implemented Deepgram STTv2 support to enable usage of the new Flux model (flux-general-en). This implementation maintains parity with the Python SDK, introducing support for turn-based transcription and preemptive generation via eagerEotThreshold.
Python Implementation : livekit/agents#3245

closes #771

Changes Made

• Added plugins/deepgram/src/stt_v2.ts: Complete implementation of STTv2 class and SpeechStreamv2 using Deepgram's V2 WebSocket API.
• Updated plugins/deepgram/src/index.ts: Exported STTv2 and STTv2Options.
• Added plugins/deepgram/src/stt_v2.test.ts: Unit tests verifying streaming transcription with the Flux model.
• Implemented TurnInfo event handling (StartOfTurn, Update, EagerEndOfTurn, EndOfTurn).
• Added support for PREFLIGHT_TRANSCRIPT events triggered by eagerEotThreshold to enable low-latency, preemptive LLM generation.

Pre-Review Checklist

• Build passes: All builds (lint, typecheck, tests) pass locally
• AI-generated code reviewed: Removed unnecessary comments and ensured code quality
• Changes explained: All changes are properly documented and justified above
• Scope appropriate: All changes relate to the PR title, or explanations provided for why they're included
• Video demo: A small video demo showing changes works as expected and did not break any existing functionality using Agent Playground (if applicable)

Testing

• Automated tests added/updated (if applicable)
• All tests pass
• Make sure both restaurant_agent.ts and realtime_agent.ts work properly (for major changes)

Test Verification

Ran pnpm test plugins/deepgram with a valid API key.

• stt_v2.test.ts passed (verified streaming transcription with flux-general-en).
• stt.test.ts passed (verified no regression in existing V1 implementation).

Additional Notes

The start_time_offset is currently hardcoded to 0.0 as the base SpeechStream class in agents does not yet expose this property. This matches the current capabilities of the TypeScript SDK while enabling the new model features.

[changeset-bot]

🦋 Changeset detected

Latest commit: 997ec9d

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

This PR includes changesets to release 16 packages

Name	Type
@livekit/agents-plugin-deepgram	Patch
@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-elevenlabs	Patch
@livekit/agents-plugin-google	Patch
@livekit/agents-plugin-inworld	Patch
@livekit/agents-plugin-livekit	Patch
@livekit/agents-plugin-neuphonic	Patch
@livekit/agents-plugin-openai	Patch
@livekit/agents-plugin-resemble	Patch
@livekit/agents-plugin-rime	Patch
@livekit/agents-plugin-silero	Patch
@livekit/agents-plugins-test	Patch

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[KrishnaShuk]

PTAL @toubatbrian!

[toubatbrian]

LG! Please fix the linting issue

[KrishnaShuk]

@toubatbrian done!