B21: BRISM Onepager

BRISM (Brane Interface Substrate Model) is a structural, top-down interface framework in which physical observables are interpreted as projections of an underlying phase-structured bulk onto a real-valued measurement brane. In its current formulation, BRISM operates fully within the standard Hilbert-space formalism and treats the Born rule not as an independent postulate, but as a structural consequence of phase-neutral projection under positivity, sigma-additivity, norm conservation, and spectral stability. The framework introduces a stratified claim hierarchy. The hard current core consists of the Born-stable readout architecture together with the minimal phase symmetry U(1). Higher symmetry layers (SU(2), SU(3)) are treated as conditional structural sectors requiring additional interface-stability assumptions. The quantities epsilon = 1/pi² and X = 4*pi³ + pi² + pi are retained as working invariants of the present BRISM implementation, with strongest current support in micro-scale regimes. Across scales, BRISM organizes a set of structural correspondences, including the infrared fine-structure relation, a geometry-based interpretation of the Casimir effect, and a UV minimal-length construction derived without direct use of gravitational input. Large-scale sectors, such as cosmological constant scaling, CMB low-ell suppression, and cusp-core regularization, are interpreted as effective or exploratory projections anchored in the same interface geometry rather than as direct probes of the microscopic substrate. BRISM is not presented as a complete dynamical theory, but as a structural interface framework that unifies quantum measurement, symmetry layers, working invariants, and cross-scale phenomena within a single, explicitly stratified architecture. All BRISM papers on Zenodo >> Searchlist Supplementary structural material, dependency maps, and reproducibility notes are available in an accompanying public repository: https://github.com/swencarloheinze/brism-framework