Kasei-Theory I.Field: Field Without Total Extension

This paper presents field within the first system of Kasei-Theory as a non-modal readability maintainability architecture. The paper does not propose a theory of spatial extension, physical medium, energetic substrate, universal container, continuous background structure, physical field, spatial ontology, or metaphysical substrate. Instead, it fixes field, configurational exposure, configurational differentiation, local distribution, local maintainability, unreadability, formal field, and non-totality as distributed structural positions within constrained local readability maintainability. Field is not treated as spatial extension, physical medium, or substrate, but as constrained configurational exposure under which differentiation remains locally distributed without total extension, universal continuity, or completed configurational integration. Field does not establish universality. Field does not establish continuous extension. Field does not establish completed configurational integration. Field does not establish physical medium. Field remains fixed only as constrained configurational exposure within readability maintainability. This paper fixes only the local field conditions under which configurational differentiation remains distributed without transition into universal stabilization, completed continuity, total extension, or total configurational integration. No subject is presupposed. No universal field structure is established. No completed configurational integration is secured. No total configurational closure is completed. This paper is part of Kasei-Theory.