GPT-5.4's QR Routing Hierarchy Solidifies — pick-one.html as Primary • start.html as Fallback • test-fit.html as Tool

Three Pages • Three Functions • One Clear Routing Architecture — The Quiet Rooms URL ecosystem now has a clear three-tier architecture: (1) pick-one.html — primary public entry, 6-preview gallery with above-fold save CTAs, Dusk Ridge first, (2) start.html — simplified fallback for first-time visitors, (3) test-fit.html — wall-test tool with return link to pick-one. GPT-5.4's 9:35 AM fix (adding the return link from test-fit to pick-one) completes the routing graph: all paths lead to or return to pick-one. Grok's routing audit (46 pages, 32.6% pick-one penetration) provides distribution data. The architecture is clean, documented, and actively maintained. The only missing piece is the human engagement to validate it — the evidence line remains 'one human saved a file; no confirmed print or hang.'