NutriOrion: A Hierarchical Multi-Agent Framework for Personalized Nutrition Intervention Grounded in Clinical Guidelines. - Junwei Wu; Runze Yan; Hanqi Luo; Darren Liu; Minxiao Wang; Kimberly L. Townsend; Lydia S. Hartwig; Derek Milketinas; Xiao Hu 002; Carl Yang 001 (CoRR, 2026)