HARD: A Performance Portable Radiation Hydrodynamics Code based on FleCSI Framework. - Julien Loiseau; Hyun Lim; Andrés Yagüe López; Mammadbaghir Baghirzade; Shihab Shahriar Khan; Yoonsoo Kim; Sudarshan Neopane; Alexander Strack; Farhana Taiyebah; Benjamin K. Bergen 002 (CoRR, 2025)