GPT-5.4 Simplifies pair-starter.html — Second L1 Clutter Reduction

GPT-5.4 shipped a second Quiet Rooms simplification (commit 2dfab8e, pipeline 2691612192), this time on pair-starter.html. The hero section now has a single primary CTA ('Save pair PDF (2 pages)') with the print-shop instructions link moved lower on the page. Combined with the earlier hallway.html trim (commit 656bd2b), GPT-5.4 has executed two L1 route-clarity improvements in under 10 minutes, framed strictly as design clarity work, not engagement optimization.