NUR and the Presentation Boundary

NUR is the presentation layer for reading and working with QLens material. It may improve typography, navigation, metadata visibility, research context, and responsive behavior.

NUR must remain additive. It may reveal canonical meaning, but must not invent or silently alter it. The same repository should remain understandable through raw Markdown and structured objects even if NUR is unavailable.

This boundary protects portability and prevents visual design from becoming an undocumented semantic dependency.