RLDX-1 Technical Report. - Dongyoung Kim; Huiwon Jang; Myungkyu Koo; Suhyeok Jang; Taeyoung Kim; Beomjun Kim; Byungjun Yoon; Changsung Jang; Daewon Choi; Dongsu Han; Donguk Lee; Heeseung Kwon; et al. (CoRR, 2026)