Sergei 3731206546 Hide Debug tab and revert TTS voice changes
- 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.
2026-01-29 10:05:10 -08:00
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