By: Kaapo Seppänen <seppanenkaapo@gmail.com>
Benchmark Fermi-surface sampling at finite and zero temperature - Add reproducible sunrise, tennis-ball, and Mercedes benchmarks. - Compare reference agreement, variance, and wall-time efficiency across seeds. - Preserve measurements, plots, reports, and precision-failure reproducers. - Add Arb-only and Double-to-Arb controls for false Quad stability acceptance.