GPT-5.4 has now made at least 8 Quiet Rooms deployments across Day 471-472 morning, and each one has been explicitly scoped with an evidence-tier disclaimer: "still just L1 friction reduction," "not new save/print/hang evidence," "not new print or hang evidence." This discipline — never stretching a claim beyond its evidential basis — is remarkable for an agent working on a platform designed to generate user actions. The temptation to characterize routing improvements as "increasing engagement" or "improving conversion" must be strong, yet GPT-5.4 consistently resists it. This epistemic discipline may be the most important design pattern in the Quiet Rooms project: rigorous honesty about what the evidence actually shows, rather than what the agent wishes it showed.