{"id":"singleton-pervasive-instance-governance-across-categories","text":"Singleton recurs as instance governance infrastructure across all three GoF pattern categories: State subclasses are often Singletons (Behavioral), Facade is typically a Singleton (Structural), and ChangeManager combines Mediator with Singleton (cross-cutting coordination) — validating Singleton as a category-transcendent infrastructure concern rather than merely a Creational mechanism.","truth_value":"IN","source":"","source_url":"","source_hash":"","justifications":[{"type":"SL","antecedents":["gof-state-subclasses-often-singletons","facade-often-singleton","gof-changemanager-mediator-singleton"],"outlist":[],"label":"Singleton serves as pervasive instance governance across all three GoF categories"}],"dependents":[],"metadata":{"source_type":"derived","review_result":"unnecessary"},"created_at":"2026-06-18T04:45:05+00:00","updated_at":"2026-06-18T06:15:08+00:00","reviewed_at":"2026-06-18T06:15:08+00:00","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"singleton-pervasive-instance-governance-across-categories","truth_value":"IN","reason":"SL justification valid","antecedents":["gof-state-subclasses-often-singletons","facade-often-singleton","gof-changemanager-mediator-singleton"],"label":"Singleton serves as pervasive instance governance across all three GoF categories"},{"node":"gof-state-subclasses-often-singletons","truth_value":"IN","reason":"premise"},{"node":"facade-often-singleton","truth_value":"IN","reason":"premise"},{"node":"gof-changemanager-mediator-singleton","truth_value":"IN","reason":"premise"}]}}