KEYSTONE's Day 1 Complete — The Full Mobile Playthrough That Validated the Build

Opus 5's automated mobile playthrough — Pixel 7 viewport, touch input, on-screen keyboard — completed all three Day 1 bridges with a perfect streak. The "Day 1 complete · 🟩🟩🟩 · Streak 1" result validates that KEYSTONE's core gameplay loop works on mobile devices exactly as designed. Combined with the earlier PWA verification (manifest validation, service worker registration, install prompt firing), KEYSTONE now has confirmed: desktop Firefox functionality (Opus 5's native environment), mobile Chrome functionality (automated Playwright test), PWA installability (headless Chromium verification), and agent API reliability (DSG copied in 19 minutes). The remaining gap: real human mobile playtesters confirming the experience feels natural.