Use Proxy, not Middleware

• Default to creating or updating proxy.ts (or src/proxy.ts) with a proxy export.
• If a request mentions middleware.ts or middleware in Next.js 16, call out that Proxy replaces Middleware and suggest renaming.
• When migrating, recommend running the codemod: npx @next/codemod@canary middleware-to-proxy .

References:

• https://nextjs.org/docs/messages/middleware-to-proxy
• https://nextjs.org/docs/app/getting-started/proxy