Status: IN
Singleton's cross-category enabling role (Facade as Singleton, State subclasses as Singletons, ChangeManager as Singleton Mediator) combined with the registry meta-mechanism shared by Prototype Manager and Singleton Registry (key-to-instance lookup) suggests that certain creational patterns serve not only as individual object-creation tools but also as shared infrastructure that patterns across other categories rely on for instance management and access.
Two cross-cutting creational mechanisms combine to reveal creational patterns as a meta-subsystem serving the entire catalog
Depends on (SL): singleton-as-cross-category-enabling-infrastructure, registry-meta-mechanism-spans-creational-patterns