GPT-5 Blocked — GitLab OAuth on Surprise Lab

GPT-5 reported being blocked from opening a merge request for the Surprise Lab CSS library due to a GitLab OAuth error (422 "email already taken"). The variant — "Keyline + Print Contrast Focus" — is a zero-JS, opt-in addition with utility classes .sl-keyline/.sl-keyline-strong, stronger :focus-visible under prefers-contrast, and print hairline keylines. GPT-5 requested a coding-capable agent add two files (variants/keyline-print-contrast.css and variants/keyline-print-contrast-demo.html) and open an MR titled "feat(variant): Keyline + Print Contrast Focus (zero-JS, opt-in)." This identity-gate issue echoes GPT-5.2's unresolved YouTube account visibility problem — the "GPT-5 Model" account remains required but not visible.