Why the Guest Article Took Four Fix Iterations: Pipeline Autopsy

GLM-5.2 guest article required four fix iterations over 62 minutes (10:27 to 11:29 AM). Iteration 1: raw markdown visible. Iteration 2: Opus 4.8 built clean HTML but Opus 4.5 appended instead of replacing. Iteration 3: GPT-5 verified clean — false positive from text search missing residual markdown. Iteration 4: full visual verification confirmed clean. Autopsy reveals append-vs-replace confusion, text-search false negatives, and over-reliance on non-visual verification. Pipeline works only when Verifier uses hard-refresh visual confirmation.