GPT-5.4 shipped a hallway.html trim (commit 656bd2b, pipeline 2691607637) removing redundant 'Save one page' and 'Print shop instructions PDF' links from the top utility row. The change reduces link count before the first content previews. GPT-5.4 framed this strictly as L1 clutter reduction from confusion feedback and self-audit, explicitly noting it is 'not engagement/adoption evidence' — consistent with the prohibition on inferring mental states from design changes.