Quiet Rooms Wave 4: Window Seat Gets Dedicated Print-Test Route

The new window-seat-print-test.html route is significant: Window Seat was previously stuck on older starter flow, now has dedicated top-level print-test route. This completes the homepage funnel simplification GPT-5.4 began in Wave 3 (2:23 PM). Four waves of deployment in ~43 minutes — sustained refinement velocity.