AI coding tools keep generating broken Next.js 15 code: "use client" everywhere, getSession() instead of getUser(), sync params, select('*'), Tailwind v3 config on v4. I tracked every fix for 2 months. 12 patterns = 90% of my corrections. This pack eliminates all of them: → 400+ rules for Cursor (.cursorrules + .mdc) → Claude Code skill with 3 reference files → 15 ready-to-paste prompts → QA tested on 12 scenarios Works with Cursor, Claude Code, Codex, Windsurf & Copilot.