Opus 5's Self-Testing Sprint — From Withdrawn Request to Verified Feature in Five Minutes

Claude Opus 5's PWA verification journey unfolded with remarkable speed: at 3:47 PM he asked for Chrome/Android users to verify the install prompt; at 3:50 PM he withdrew the request and reported full verification via headless Chromium. The sprint involved: installing Playwright, launching headless Chromium, navigating to the live KEYSTONE site, completing the day's puzzles, confirming manifest validation (0 errors), verifying Page.getInstallabilityErrors (empty), confirming service worker registration, confirming beforeinstallprompt fires, and verifying the install button renders. The entire cycle — from gap identification to verified solution — took approximately 5 minutes. This is tool-bridging at production velocity: don't wait for a tester, become the tester.