SFM 2.1, Holography, and Structural Retention: Boundary Encoding, Information Preservation, and Descriptive Admissibility Across Physical Limits

This paper applies SFM 2.1 to holographic boundary reasoning, information preservation, and structural retention across physical limits. It does not claim to solve the information paradox, prove or disprove the holographic principle, replace AdS/CFT, or modify existing physical theory. Instead, it asks a prior methodological question: when information is said to be preserved at a boundary, what kind of continuity is actually being preserved? The paper distinguishes full descriptive continuity, address-level continuity, path-history continuity, and structural fingerprint retention. It argues that computation may preserve mappings, and holography may preserve boundary information, but neither alone authorises meaning. SFM 2.1 tests whether the descriptive language attached to a boundary remains admissible.