fix(tooling): harden database env loading

AGENTS.md

@@ -31,6 +31,10 @@ npm test
 npm run dev
 ```
 
+### Database commands
+Use the repo-level `pnpm db:*` commands or `pnpm db:prisma -- <args>` for Prisma work.
+These wrappers auto-load `.env`, `.env.local`, `.env.$NODE_ENV`, and `.env.$NODE_ENV.local`, so direct raw Prisma commands should be avoided unless `DATABASE_URL` is already exported in the shell.
+
 ## Agent Coordination
 
 ### Swarm Configuration