- the bound surface is inventoried from the app alone, but assay is a
consumer too — which is why BRepPrimAPI_MakeSphere is unbound and
assay's fixture generator has been unrunnable since the cutover.
- the GIL rationale for STEP/IGES predates 8.0's thread-safety
contract and should cite why that contract does not apply to us.
- TKHelix is compiled by the builder image but not in the link list.
