The experimental CellMap explicitly stores vertices, edges, faces, adjacency,
and attributes. divideCells performs deterministic contact-preserving centroid
division. Maps validate and triangulate to mesh data.
createPlanarCellLayer, createSphericalCellLayer, and createCellVolume are
functional planar, spherical, and 3D baselines. They demonstrate the general
Chapter 7 mechanisms; they do not claim species-calibrated tissue simulation.