NumCosmoGalaxyShapeFactorupdate_data_at_nodes_crit

Refreshes data‘s per-node critical surface density cache, using the lens context cached by the last nc_galaxy_shape_factor_prepare() call. This cache depends only on self->lens_ctx/self->cosmo/ self->surface_mass_density (not on density_profile or the projected radius), and lens_ctx is refreshed whenever nc_galaxy_shape_factor_get_optzs_hash() changes (see prepare()’s own doc comment) — so call this whenever that hash changed, or whenever the node grid itself was rebuilt (different/resized z_nodes).