Meeting mode was triggering on any speech (VAD) which caused false
starts when user spoke near the mic without being in a call. Now
requires system audio energy above threshold as primary trigger.
Speech is only used as fallback when combined with ANY system audio
data present, catching low-volume Electron/WebRTC apps.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
b911eefe72