CubicalPersistenceInChunksContext

Thin Cube-specific wrapper, exactly mirroring PersistenceInChunksContext above -- CellularPersistenceInChunksContext[Cube, ...] (including its own unionFindDim01 dimension-0/1 fast path) already has no Cube-specific behavior needed anywhere: Cube is OrderedCell (defaultCubeIsOrderedCell, CubicalOrderedCell.scala) resolves automatically, so this class is a pure ergonomic convenience, not new capability -- CellularPersistenceInChunksContext[Cube, ...] was already cross-validated against CubicalHomologyContext directly (CubicalStreamSpec's own tie-heavy-fixture and random-image cross-validation sections, including the union-find fast path specifically), the exact validation .claude/DESIGN-fast-cubical-engine.md's own Phase 1 called for, just not yet under this name. .claude/WORKLOG-fast-cubical-engine.md.