Descriptive Collapse Beyond the Horizon (on the structural limits of information attribution in closed realization regimes)

This manuscript presents a focused structural analysis within the General Realization Mechanics (GRM) framework. It addresses a single, well-delimited question: the conditions under which informational attribution remains a legitimate descriptive operation in closed realization regimes. The work does not introduce new axioms, physical models, temporal assumptions, or empirical claims. It does not engage with dynamical theories of spacetime, nor does it attempt to synthesize or unify distinct conceptual results within GRM. In particular, it remains explicitly separate from prior GRM analyses concerning temporal realization or generativity. By examining closed realization regimes with stabilized horizontal asymmetry of admissibility, the manuscript demonstrates a necessary structural consequence: when backward descriptive reachability collapses across a horizon-like boundary, informational attribution becomes structurally inaccessible. Under such conditions, the notion of information preservation does not fail empirically or dynamically; it ceases to be well-defined within the available descriptive framework. This result is methodological rather than explanatory. It neither asserts information loss nor proposes alternative mechanisms. Instead, it identifies a boundary beyond which commonly employed informational language exceeds the structural conditions required for its meaningful application. Within GRM, this work should be read as an analysis of a single boundary condition — a descriptive edge of admissibility — rather than as a component of a unified narrative or a step toward theoretical closure. Its role is not to complete the framework, but to delineate one of its limits with precision and restraint.