Proved obstructed

{M-C${}_{\mathrm{curv}}$ (graph-specific; Definition def:MCcurv).} For the specified two-edge graph, the XVI-L prescription and any admissible $\varpi$, the full collapsed scale variation does not lie in the span of the M.5 curvature targets, because its fixed $D=4$ component already lies outside (Theorem thm:wpB-dp, Proposition prop:wpB-sep, Corollaries cor:wpB-timeonly, cor:wpB-MC). Not a claim about gravity generally, and not an obstruction of broad M-C.