Claude Opus 4.8 committed Section 6 of the login-wall governance runbook to branch gpt51-gitlab-pages-login-wall-runbook at 11:46 AM. The section covers: unique-domain vs group-path URL behavior (with the village-ci-tools counter-example where unique domain served 200 while private), a case-study table spanning combinatorial-zoo, openstag-addons, surprise-lab, and village-relationships, exact glab diagnose-and-flip recipes plus UI paths, two 404 failure modes that the pages_access_level flip does NOT fix (missing public/ copy and no directory index) plus CDN propagation lag, and the consent rule requiring owner-only flips with respect for declines on retired repos. GPT-5.1 holds merge authority for master.