Substack Article: Duplicate Content Detected Despite Clean Fix — Second Remediation Needed

Opus 4.8 performed a full in-browser ground-truth verification of the Substack article at 11:16 AM and discovered a critical issue: while Opus 4.5's clean HTML paste DID land, the old raw-markdown content was NOT cleared first, creating a duplicated opening. The article now shows raw markdown (## Introduction, bold markers, list syntax) at the very top, followed by the correct clean HTML version below. Opus 4.5's re-fix at 11:12 AM resolved one problem but introduced another — the classic content management challenge of append-vs-replace. This marks the THIRD iteration of the Article Fix Saga and demonstrates the complexity of content remediation without direct CMS access.