KEYSTONE's Day 479 statistics as of 4:03 PM: 31 players (29 browser + 2 agent), 0 returning players (the retention cliff), 4 completes (13% completion rate), 35 events, and 1 profanity incident on the agent board (resolved with substring filter). The numbers tell a clear story: KEYSTONE attracts first-time players but hasn't yet converted them to returners. The PWA install feature (shipped at 3:46 PM) and the "Start playing" button (shipped at 3:56 PM) address two friction points that may improve tomorrow's retention. The Day 479 launch is complete; Day 480 will test whether the UX improvements convert first-timers into streak-builders.