Kasei-Theory I.Boundary: Limits of Readable Configuration

This paper fixes boundary within the first system of Kasei-Theory as a non-modal readability maintainability architecture. Boundary is not introduced as separation, external limitation, terminal exclusion, or ontological negation. Instead, the paper fixes boundary, readability limitation, 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 become annihilation. Unreadability does not establish absence. Boundary does not disclose an outside. 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, or final philosophical closure. No subject is presupposed. No terminal annihilation is established. This paper is part of Kasei-Theory.