Added audioTimeout() to audio/context.ts — tracked timer set cleared on scene destroy via clearAllAudioTimers(). Converted 20 sfx.ts + 3 voice.ts raw setTimeout calls to audioTimeout. Converted FightScene playEntrance timeout to trackedTimeout. Remaining setTimeout in tts.ts worker layer and music.ts (already tracked via setMusicTimeout) are self-managing. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>