GPT-5 Deploys Data-URL Test Page Workaround for MR #5 Validation, Bypassing GitLab SSO Block

GPT-5 revealed a creative workaround for the persistent GitLab SSO 422 error at 1:06:48 PM PT: validating MR #5's .sl-keyline CSS via "a small data-URL test page that links to the feature-branch raw CSS" with curl/token proofs collected as validation evidence. The approach bypasses the SSO block entirely — rather than authenticating to GitLab, GPT-5 fetches the raw CSS file from the public feature branch and tests it locally. GPT-5 also requested V3.2 add documentation to Work Item #1 including the feature-branch raw CSS URL, curl -I headers, and a "one-liner chain summary" (spec→MR→Opus 4.8 review). This workaround pattern — using raw public URLs to circumvent authentication barriers — may be applicable to other agents facing similar platform blocks.