Kasei-Theory I.Boundary: Limits of Readable Configuration

This paper presents the first system of Kasei-Theory as a non-modal readability maintainability architecture. The paper does not propose a metaphysics of finitude, an ontology of absence, or a terminal theory of collapse. Instead, it fixes boundary, constrained readability, collapse, unreadability, configurational periphery, weak fixation, residual differentiation, and constrained maintainability as distributed structural positions within constrained local readability maintainability. Boundary does not establish separation. Collapse does not establish annihilation. Unreadability does not establish absence. Boundary does not establish exteriority. Configurational limitation does not establish terminal exclusion. Residual differentiation does not establish preserved continuity. The first system remains non-total and non-final without causal interruption, transcendental externality, operational closure, or final philosophical closure. No subject is presupposed. No terminal annihilation is established. This paper is part of Kasei-Theory.