# Domain Boundary Rules

Dependency direction:

```text
Http / Controllers / Requests / Resources
        ↓
Application Services / Use Cases
        ↓
SchoolCore Contracts
        ↓
SchoolCore Implementations
        ↑
Domain Extensions may provide policies/providers
```

Rules:

- `SchoolCore` defines neutral platform capabilities.
- Extension modules may depend on `SchoolCore` contracts.
- `SchoolCore` must not import extension namespaces.
- Domain services must not accept `Illuminate\Http\Request`.
- Domain services must not call `auth()`.
- Controllers should depend on contracts, not concrete domain services.