heliobench 0.2.0

Solar system navigation physics boundary benchmark v2.0: Saito(1977) coronal B-field multipole model, Leblanc(1998) two-component corona density, PSP-calibrated Alfven surface (12-19 R_sun), first-principles radiation-equilibrium ice lines, Chapman-Ferraro magnetopause with Juno/Cassini validation, Voyager-calibrated heliosphere termination shock (94.1 AU) and heliopause (126.6 AU). CODATA 2018 / IAU 2015 / JPL DE440.