Add xAI TTS speed option

[rosetta-livekit-bot]

Summary

Port livekit/agents #6394 by adding the speed provider option for xAI TTS inference in the JS SDK.

Source diff coverage

Coverage classification

Source file	Classification	Target handling
livekit-agents/livekit/agents/inference/tts.py	Ported	Target counterpart is agents/src/inference/tts.ts. Ported the added XaiOptions.speed field to XaiTTSOptions as speed?: number, using the existing modelOptions forwarding path for provider-specific inference options.

Testing

• pnpm test agents/src/inference/tts.test.ts passed: 51 passed, 1 skipped.
• pnpm build passed.
• pnpm lint passed with existing warnings.
• pnpm test agents failed in agents/src/voice/amd.test.ts with 11 AMD-related failures; these are unrelated to this type-only inference TTS option port.
• pnpm api:check failed before reaching changed API validation because @livekit/agents-plugin-bey has no api-extractor.json.
• pnpm --filter @livekit/agents api:check failed on an existing API Extractor limitation: The "export * as ___" syntax is not supported yet in agents/dist/index.d.ts:10:8.

Notes

• No source tests were added or modified in #6394, so no new tests were added here.
• No infrastructure gap: xAI TTS provider options already flow through modelOptions to the inference gateway.
• cue-cli validation was not run because this port does not touch voice pipeline runtime behavior.

---

Ported from livekit/agents#6394

Original PR description

No description.

[changeset-bot]

🦋 Changeset detected

Latest commit: 3f557ea

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

This PR includes changesets to release 36 packages

Name	Type
@livekit/agents	Patch
@livekit/agents-plugin-anam	Patch
@livekit/agents-plugin-anthropic	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-did	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 bugs or issues to report.