Pure-Dart WAV synthesizer (tool/gen_sfx.dart) generates place/clear/ combo/win/lose effects; AudioService player pool fires on placement, line clears, combo streaks, and phase transitions. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
flutter create (com.airkjw.blockseasons, iOS+Android), Riverpod, shared_preferences, audioplayers, gen-l10n EN/KO wiring, app shell with Home -> Game placeholder. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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