5e8c8367f3
Creating AVAudioEngine at singleton init time causes macOS to switch Bluetooth headphones from A2DP (high quality) to HFP (headset) profile, resulting in degraded audio quality even when Voice Wake is disabled. This change makes audioEngine optional and only creates it when voice recognition actually starts, preventing the profile switch for users who don't use Voice Wake. Fixes #30 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>