Structural Enforcement of Finite Propagation Bounds

We show that the existence of a finite propagation bound on admissibility non-equivalence necessitates structural enforcement in any admissibility-based architecture. A bound alone is insufficient: attempted violations must encounter divergent resistance under finite deformation budgets. We formalise these requirements as structural inertia and structural energy, defined independently of dynamics, trajectories, or physical instantiation. Together, they enforce finite propagation by rendering forbidden admissibility transitions unattainable under finiteness. The result identifies structural conditions that any physical enforcement of propagation bounds must satisfy.