mod_interface 0.63.0

Protocol of modularity unifying interface of a module and introducing layers.
Documentation 
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# Backlog

Tasks reviewed but not yet promoted to active for the `mod_interface` crate.

## File Responsibility Table

| Entry | Responsibility |
|-------|----------------|
| `002_compile_fail_layer_boundary_tests.md` | Add trybuild compile-fail tests for layer isolation |
| `003_priv_use_visibility.md` | Implement `priv use` private-visibility directive |
| `004_macro_reexport.md` | Implement macro re-export via layer directives |