nextjs-arch — Clean Next.js App Router Architecture

This skill enforces a specific project architecture for Next.js App Router applications. It is not generic guidance — it is an opinionated constraint system based on a proven production structure.

Read every rule before writing code. Every rule is testable — you should be able to look at the file tree and answer yes/no.

Directory Structure

This is the canonical layout. Do not invent new top-level directories. Every file has exactly one correct home.