fix(xai): expose TTS websocket options

Author: rosetta-livekit-bot[bot]

.changeset/xai-tts-websocket-options.md

@@ -0,0 +1,5 @@
+---
+'@livekit/agents-plugin-xai': patch
+---
+
+Add xAI TTS websocket support with voice, language, latency, speed, and text normalization options.

plugins/xai/src/index.ts

@@ -5,6 +5,7 @@ import { Plugin } from '@livekit/agents';
 
 export * as realtime from './realtime/index.js';
 export { STT, type STTOptions, type STTLanguages } from './stt.js';
+export { TTS, type GrokVoices, type TTSLanguages, type TTSOptions } from './tts.js';
 
 class XAIPlugin extends Plugin {
   constructor() {