Remark: No curved split calculus

All wavefront calculations, covector sums, diagonal kernels, ${\Delta }_{\mathrm{F}}$, ${\mathsf{E}}_{\mathrm{A}}$, and ${\mathsf{E}}_{\mathrm{R}}$ in this file belong to the completion. A sum of covectors using Minkowski's affine identifications is not, by itself, a cone condition on ${\mathcal{M}}^{\circ }$.