feat: add AGENTS.md for all packages and apps (9 files)

apps/web-next/AGENTS.md

@@ -0,0 +1,16 @@
+# apps/web-next — Next.js 15 Reference App
+
+Thin Next.js app consuming `@repo/api-client` for data and `@repo/ui` for components.
+
+## Key Files
+
+- `src/app/api/trpc/[trpc]/route.ts` — tRPC HTTP endpoint (fetch adapter)
+- `src/app/providers.tsx` — Wraps with `<ApiProvider>`
+- `src/app/layout.tsx` — Root layout
+
+## Rules
+
+- Use `@repo/api-client` hooks for all data fetching
+- Use `@repo/ui` components for all UI
+- tRPC endpoint imports `appRouter` from `@repo/api`
+- Payload instance initialization goes in `src/lib/payload.ts`