Non-negotiable rules:

1. Read references/stack.md first.
2. Read the repository's AGENTS.md, CLAUDE.md, and closest module map when present. They define the real route families, localization, design/theme, auth, transport, and test contracts.
3. Read the application package.json, resolved lockfile, and the installed version-matched Next.js docs under that package's node_modules/next/dist/docs/ before applying version-specific guidance.
4. Follow the installed version unless the user explicitly requests an upgrade. Never upgrade, downgrade, or switch release channels during unrelated work.
5. Then load only the references needed for the actual task.
6. Keep user-visible text translated and all backend traffic in the project's shared API transport.
7. Keep the heavy Next.js guidance in references/, not inline here.

nextjs

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