3 items across 2 sections
lib/tracks.ts imported fs and path at the top level. track-roadmap.tsx (a 'use client' component) imported from lib/tracks.ts, pulling Node.js modules into the browser bundle. Build failed with Module not found: Can't resolve 'fs'.
Built Phase 4 Execution Tracks architecture, rebuilt the Claude Code Operator track with 8 modules, created the Failure Archive content section, and wrote 3 real failure reports.
export const runtime = 'edge' in app/opengraph-image.tsx blocked the entire Vercel deployment. Took 23 minutes to identify and revert.