- Hide voice-debug tab in production (href: null) - Revert VoiceContext to stable version (no Samantha voice) - Add platform badge to Debug screen (iOS/Android indicator) - Remove PRD.md (moved to Ralphy workflow) TTS voice quality improvements caused 'speak function failed' error on iOS Simulator (Samantha voice unavailable). Reverted to working baseline: rate 0.9, pitch 1.0, default system voice.