C.29:6.1a - C.29-local naming guard

MathLensUse.* instruments are C.29-local unless separately admitted.

When one C.29 application needs a mathematical-lens name to become reusable outside that application, use F.18 local-first naming; when it quantifies over a class of described entities, use C.3 Kind-CAL; when it creates or reuses a durable concept or record family, use F.8 minting or reuse and E.9 design-rationale discipline.