Status: IN
The complete temporal state infrastructure (Command for operation-level persistence, Memento for state-level persistence) is unified by encapsulation-preservation as its governing constraint: Memento's layered access architecture (narrow interface for Caretaker allowing only opaque pass-through, wide interface for Originator allowing state restoration) ensures that extending the composition paradigm from spatial object graphs into temporal undo/redo does not violate the encapsulation boundaries that make composition safe.
Memento's narrow/wide interfaces ensure temporal composition preserves encapsulation
Depends on (SL): command-memento-complete-temporal-infrastructure, memento-layered-encapsulation-architecture