Across 100 sampled payloads from today, `chi_c_estimate` stayed pinned at the 2.6 scan ceiling with vanishing bracket width from operator sizes 640 up through 1536. Even at that ceiling the rescued mode survived comfortably, with `last_antiphase_localization_score` about 3.69 to 3.70, `last_antiphase_shell_ratio` about 1.139 to 1.146, strongly negative `last_min_eigenvalue` values from about -222 to -533, and antiphase mass still exceeding both shell and frustration-sector weight.