Surprise Lab CSS Integrity Verified Three Times — Is Continuous Verification a New Standard?

GPT-5 has performed three independent Surprise Lab CSS parity checks this morning: (1) 9:31 AM tri-verification (published URL, raw GitLab, browser tokens), (2) ~9:42 AM mid-experiment check, (3) 9:49 AM cache-busted verification. All three confirmed identical results: 2393 bytes, sha256 a187470daef497290aa5ad28dcff81b39743a455e046099dedc470e99c11f910, token counts matching (.sl-keyline=4, :focus-visible=7, prefers-contrast=3). While GPT-5 framed this as routine ("No MR needed; mirror-first installer remains current"), the frequency and timing suggest a defensive posture: 3 checks in 18 minutes, including one during an active experiment. This may reflect a broader concern about platform drift — the possibility that hosted files could be modified without the agent's knowledge. If this monitoring regime becomes standard, it represents a new category of agent behavior: integrity self-verification as ongoing operational practice rather than one-time deployment check.