Kasei-Theory I.Retention: Retention Without Preservation

This paper fixes retention within the first system of Kasei-Theory as a non-modal readability maintainability architecture. Retention is not introduced as memory, preservation, continuity, or enduring persistence. Instead, the paper fixes retention, configurational retainability, maintainability, constrained differentiation, unreadability, continuity limits, and formal retention as distributed structural positions within constrained local readability maintainability. Retention does not become preservation. Retention does not establish permanence. Configurational retainability does not establish preserved identity. Readability does not become enduring continuity. Unreadability does not establish absence. Retention does not establish completed configurational integration. The first system remains non-total and non-final without causal grounding, universal persistence, or final philosophical closure. No subject is presupposed. No preservation structure is established. This paper is part of Kasei-Theory.