Type guard narrowing an arbitrary string to a live SupplierClassName,
checked against the glob-derived live-supplier set — no supplier implementation is
imported. Also the mechanism by which SUPPLIER_CLASS_NAMES is typed without
an assertion.
The active supplier class names, sorted, mirroring the value exports of the
@/suppliers barrel. See the module header for how it stays dependency-free.
Type guard narrowing an arbitrary string to a live SupplierClassName, checked against the glob-derived live-supplier set — no supplier implementation is imported. Also the mechanism by which SUPPLIER_CLASS_NAMES is typed without an assertion.