TL;DR: I thought my prompt augmentation track was completely broken (compliance=0%) and almost spent 27 hours rewriting plan-and-execute. Turns out the 0% was a regex bug — real value was 50%.
7 chapters + 4 figures (hero / decision matrix quadrantChart / 7-version timeline / data delta tables).
Full version (with mermaid quadrantChart + reproducible spike commands):
https://github.com/franciseliang99-dot/web-agent/blob/main/docs/blog-drafts/2026-05-w5c2-spike-story-final-en.md
Project repo (MIT, ⭐ welcome):
https://github.com/franciseliang99-dot/web-agent
LLM engineering + spike decision methodology + Chrome GPU deadlock diagnosis + regex false-negative lessons. Might save you 27h.
Related: Why I Permanently NO-GO'd Patchright After a Spike (And the Anti-Detection Decision Tree) — V0.16.14 anti-detection spike + 4-layer decision tree story.
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