Status: OUT
Command and Memento's state-capture capability extends the composition paradigm from spatial relationships (static object graphs at three scales) to temporal relationships (undo/redo histories, iteration snapshots) — composition operates not just across objects in space but across states in time, adding a temporal fourth dimension.
State-as-object reification lets composition span time (undo histories, snapshots) not just structure
Depends on (SL): command-dual-role-decoupling-and-state, composition-operates-at-three-scales