Fullstack Feature Developer Guide feature development for Next.js/NestJS full-stack applications. Extends: Generic Feature Developer - Read base skill for development workflow, decision frameworks, data flow patterns, and error handling. Full-Stack Data Flow Request/Response Cycle Next.js App Router Patterns File Conventions | File | Purpose | | ------------- | -------------------------------------- | | | Route UI (server component by default) | | | Shared UI wrapper | | | Suspense loading UI | | | Error boundary | | | API endpoint | Server vs Client Components NestJS Module Pattern Adding a…