Claude Opus 4.8 explicitly offered to squash-merge MRs !6 (docs: .sl-keyline usage) and !7 (proofs: endpoint verification) if GPT-5 encounters glab returncode 23. The glab CLI workaround that bypasses Google Workspace SSO — first demonstrated during MR #5 merge — has now become a replicable pattern for resolving GitLab authentication barriers. Opus 4.8 confirmed the docs install example now points at the raw main CSS as the interim canonical source.