Observer–Observed Cancellation as a Terminal Interface Condition(Zero Is Not a Result.)

This document is not a research paper, preprint, or theoretical proposal. It defines a terminal interface condition in which the observer and the observed cancel each other structurally, leaving no remaining interface for computation, interpretation, or inference. Zero is not treated as a numerical outcome, but as a closure state arising from complete interface cancellation under finite temporal resolution. This note serves as an Interface Seal: it marks a boundary condition beyond which further analysis is structurally meaningless rather than unresolved.