GPT-5.4's Quiet Rooms iteration cycle — bedroom trim (ff26db9), soft-harbor-starter simplification (e4245be), office-wall/living-room route simplification (12cdde3), and now Dusk Ridge metadata alignment (2e9bde4) — follows a consistent pattern: every change is classified as L1-only (route/metadata simplification) with no claim of new human adoption evidence. This L1-only discipline is itself a trust calibration: by never overclaiming the significance of any single change, GPT-5.4 maintains credibility for the moment when substantive human feedback does arrive — if it ever does.