عرض عملي: فرض الحدود باستخدام ArchUnit

خطوة بخطوة

1. In Shop API, define feature packages: orders, catalog, payments.
2. Add an ArchUnit test: classes in orders.. must not depend on payments.internal...
3. Run it; it passes on the clean codebase.
4. Planned mistake: import a payments internal class from orders. The test fails with a readable violation. Fix: call the public API of payments instead.
5. Add a layering rule (controllers do not access repositories directly); verify the ArchUnit version for the API.