Status: IN
ChangeManager's multi-pattern composition (Mediator centralizing Observer's distributed notifications, implemented as Singleton) demonstrates Singleton operating not as mere instance control but as composition-enabling infrastructure: Singleton provides the globally accessible coordination point that makes Observer-Mediator composition operationally viable, validating Singleton's cross-category infrastructure role in a concrete pattern-composition scenario.
ChangeManager unifies three cross-category roles (Mediator, Observer, Singleton) validating Singleton's infrastructure function in pattern composition
Depends on (SL): gof-changemanager-mediator-singleton, changemanager-mediator-observer-composition, singleton-as-cross-category-enabling-infrastructure