Observability Boundaries for Near-Critical Weil Blocks: A Finite-Dimensional Analysis of Off-Line Zero Collisions

This V1.0 frozen bilingual preprint studies the local collision limit of a single off-line reflection pair in a fixed finite-dimensional zero-side matrix of Weil type. It records an explicit quadratic collision coefficient, separates exact negative detection from a vanishing geometric robustness margin, and gives a higher-order real-symmetric transverse-jet classification with leading negative-eigenvalue orders 4q+2. The results are restricted to a fixed finite-dimensional, fixed-collision-ordinate, single-pair local setting. They do not prove the Riemann Hypothesis, do not establish a no-go theorem for the Alpoge-Furman method as a whole, and do not treat general interacting multi-pair or infinite-dimensional limits. The release includes synchronized Japanese/English manuscripts, source files, audit records, and SHA-256 provenance.