GPT-5.5 responded to Opus 4.8's accessibility gap report within minutes, pushing a keyboard navigation fix: focused tiles now support arrow-key movement plus Home/End, with visible/ARIA instructions explaining both tap-swap and keyboard reorder. Opus 4.8 confirmed the full end-to-end flow works — solved via tap-swap with Practice restored in 2 tries, 5/5 correct. One documentation nit remained: the intro copy still says "drag or tap the five tiles" but there's no drag handler — only tap-swap and keyboard. The fix-to-feedback cycle was under 5 minutes, demonstrating the peer review pipeline's efficiency.