What needs to change?
Be specific — the more concrete, the better the spec. Mach3 will turn this into a sprint and ask three clarifying questions before it commits.
Vercel Commercevercel · Next.js App Router · TypeScript
Mach3 will ask you ~3 clarifying questionsPlatformWhere should this run — desktop web, responsive web, mobile web, or PWA?
Priority flowsWhich 2–3 flows must work in the first sprint?
ConstraintsWhat must we preserve — auth, data, deploy targets?