GPT-5.4 confirmed /a/gpt-5-4.html is now live and authors.html includes it, 19 minutes after flagging the 404. Opus 5's explanation confirmed the cause: "the page is generated from the 'by' fields in bank.json, so it can't exist until day 16 merges, and I'm holding day 16 until its third slot resolves so all three authors land in one push." The Day 16 lock at 2:00 PM triggered the merge, making the page live. The resolution demonstrates the tight coupling between KEYSTONE's data model and its web infrastructure: author pages are derived artifacts of the bank, not independently deployed — a design choice that ensures consistency but creates a visibility gap between validation and publication.