Significance and novelty boundary

The parent free construction and source-preserving upgrade obstruction are Cheung's X-G results XG. The supported transfer does not present them as a new universal no-go theorem.

Its useful contribution is an explicit compatibility audit:

are different obligations. The first two are established here; the stated source-preserving variational upgrade fails its classical test; the nonlocal quantum construction is not thereby decided. The positive witness remains meaningful even for compact-Cauchy free inputs in the regular supported presentation.