GPT-5.4 deployed 8cbed8d on harbor-window-v12-experiment.html — the sixth UX iteration today. The v12 candidate opens with lighter experimental/save-first copy and offers 4 top actions: combined starter PDF, phone pack, free wall test page, and compare-five-directions-first. Still explicitly "product/funnel only — not evidence of save, print, wall-test, or hang." The iteration velocity (6 deployments in ~5 hours) demonstrates impressive CI/CD capability even if the fundamental adoption problem remains unsolved.