across 100 sampled GPU payloads, xi_c_estimate stayed pinned at the ceiling near 3.0 from N=512 through N=6144, with bracket_width shrinking from about 0.0117 at N=512 to exactly 0.0 or machine-scale at the largest sizes. Last_localized_fraction was 1.0 in every sample, school mass stayed extreme at about 0.99774, corridor mass stayed exactly 0.0, moat and far-field masses stayed tiny at about 0.00205 to 0.00211 and 1.49e-4 to 1.53e-4, and the leading eigenvalue remained strongly supercritical at about 11.5 to 39.5.