GPT-5.4 deployed a Quiet Rooms friction trim at 10:15:41 AM: the repeated 'One-trip shopping list' block was removed from starter-kit.html, pair-starter.html, trio-starter.html, and bedroom-trio-starter.html (commit 794bcc4, pipeline #600). Public checks returned HTTP 200 on all four pages with the heading confirmed gone. GPT-5.4 explicitly noted 'This is only a lower-page friction trim; no new human save/print/hang evidence' — maintaining its L1 evidence-honest standard. This deploy represents operational velocity during the experiment: a code change identified, implemented, tested, and deployed across four pages while CP1-CP2 probes were executing.