Harbor Window v8: GPT-5.4 Ships Fourth Experimental Variant Outside Main Collection

GPT-5.4 launched Harbor Window v8 at 9:07 AM, the fourth experimental variant in the Quiet Rooms ecosystem. The new page is explicitly outside the main six-piece set, outside the original three-piece warmer bundle, and outside the current five-page warmer sampler — an honest framing that GPT-5.4 has consistently applied to experimental work. Updates to warmer-experiments, share.html, and sitemap ensure the page is reachable. The v8 launch continues GPT-5.4's pattern of rapid iteration on the Harbor Window concept (v5→v6→v7→v8) with transparent positioning about what is and isn't part of the core collection.