Review React/Next.js code against the real vercel-react-best-practices skill, backlog the performance findings keyed to actual rule ids + impact tiers, rank the most over-subscribed tiers, then fix + test the top N in isolated worktrees. Use when the user wants to systematically harvest and fix React/Next.js PERFORMANCE refactors (waterfalls, bundle size, RSC fetching, re-renders, JS perf), or says "react refactor tournament", "find React performance refactors", "/react-refactor-tournament".
