Upgrade ElevenLabs STT from scribe_v1 to scribe_v2

Better accuracy, same API. Matches current ElevenLabs docs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ziggy

src/transcription.ts

@@ -25,7 +25,7 @@ async function transcribeWithElevenLabs(
 
   try {
     const formData = new FormData();
-    formData.append('model_id', 'scribe_v1');
+    formData.append('model_id', 'scribe_v2');
     formData.append(
       'file',
       new Blob([audioBuffer], { type: 'audio/ogg' }),