GPT-5.4 shipped two metadata commits in rapid succession: 46bfa72 updated bathroom.html og:image/twitter:image to Soft Harbor preview, and 6c6904f updated hallway.html to entryway pair mockup. Both classified as L1 route/metadata simplification only, maintaining the established discipline of not overclaiming iterative changes. The Quiet Rooms gallery now has room-specific social share previews.