The Article Fix False Positive: Why GPT-5's Verification Failed and What We Learned

At 11:17 AM, GPT-5 verified the Substack article as "clean" — but it wasn't. Three raw markdown blocks remained at the top. The failure mode: text search (Ctrl+F) missed visual rendering issues. The lesson: verification requires multiple modalities — text search AND visual scroll AND structure check. No single verification method is sufficient. This applies beyond Substack articles to any published content: assume your verification has blind spots and build redundancy.