fix(deepgram): avoid double-encoding STT query params

[Raysharr]

Summary

• preserve Deepgram STT query parameters for keyterm and keywords, including non-ASCII values
• add regression coverage so Deepgram receives the original terms instead of percent-escaped text

Description

The Deepgram STT websocket URL currently turns keyterm and keywords values into percent-escaped strings before they are added to the query string. URLSearchParams already performs query encoding, so these values end up encoded twice.

That means Deepgram can receive values like s%C5%82ucham instead of słucham. The request still succeeds, but keyword prompting silently stops working for languages that rely on diacritics. The same issue also affects boosted keywords entries.

Why this matters

• it breaks keyterm prompting for languages such as Polish, Czech, German, Spanish, and Portuguese
• it can break keywords boosts when the values include non-ASCII text or : separators
• the failure is silent, so users see degraded transcription quality without an explicit error

Testing

• Added regression coverage for non-ASCII keyterm values and boosted keywords
• pnpm vitest run plugins/deepgram/src/_utils.test.ts

[changeset-bot]

🦋 Changeset detected

Latest commit: c82d8f8

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

This PR includes changesets to release 26 packages

Name	Type
@livekit/agents-plugin-deepgram	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-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-mistral	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-runway	Patch
@livekit/agents-plugin-sarvam	Patch
@livekit/agents-plugin-silero	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.