This record contains two related but distinct works exploring the structural consequences of finite interaction capacity as a constraint on physically admissible configurations. Structural Consequences of Finite Interaction Capacity develops a general structural framework based on finite interaction capacity, examining implications for persistence, collapse, irreversibility, entropy, agency, and meaning, without appeal to observers, anthropic assumptions, or infinite resources. Finite Interaction Capacity as an Admissibility Layer Completing the Feynman Path Integral is a preliminary and exploratory application of this framework to the Feynman path-integral formulation of quantum mechanics. It does not modify the interference calculus and is intended solely as a possible admissibility restriction on the domain of integration. The second document depends conceptually on the first but may be read independently as a technical note.