Assists with building full-stack React web applications with Remix v2 and its successor, React Router framework mode. Use when creating apps with nested routing, loader/action patterns, progressive enhancement, or deploying to Node.js, Cloudflare Workers, or other adapters, or when migrating Remix v2 to React Router v7. Trigger words: remix, remix run, loader, action, useFetcher, nested routes, progressive enhancement, remix to react router.