NumCosmoGalaxyShapeFactorprepare

Factory-level prepare: refreshes the geometry/profile caches shared by every galaxy (only recomputing whichever half actually went stale, judged by hashing the models each half depends on), refreshes the cached model references NcGalaxyShapeFactor‘s own per-Data updates use (nc_galaxy_shape_factor_update_data_radius(), nc_galaxy_shape_factor_update_data_optzs(), nc_galaxy_shape_factor_update_data_pop()), then calls the subclass’s own prepare hook. Cheap/no-op when nothing relevant changed — safe and correct to call unconditionally every orchestrator prepare() cycle.