Status: IN
ChangeManager demonstrates that Observer's unexpected-updates liability can be mitigated through pattern composition (Observer+Mediator+Singleton) rather than application-specific safeguards, showing that the GoF catalog contains self-healing compositions where one pattern's liability is structurally addressed by composing with others.
ChangeManager is a concrete example of liability-resolving pattern composition — the unexpected-updates problem from observer interdependencies is exactly what DAGChangeManager's mediating role prevents
Depends on (SL): changemanager-mediator-observer-composition, gof-observer-unexpected-updates-liability, gof-changemanager-mediator-singleton