Reproduce NASA NAIF SPICE ephemeris, angle, and ground-station visibility regression checks from pinned…

Reproduce NASA NAIF SPICE ephemeris, angle, and ground-station visibility regression checks from pinned…: a task in Long-Horizon Terminal-Bench (LHTB) (Harbor dataset). Implement the SPICE audit pipeline in src/spice audit/audit.py . The project already contains pinned NAIF kernels under kernels/…