SurGo-R1: Benchmarking and Modeling Contextual Reasoning for Operative Zone in Surgical Video. - Guanyi Qin; Xiaozhen Wang; Zhu Zhuo; Chang Han Low; Yuancan Xiao; Yibing Fu; Haofeng Liu; Kai Wang 092; Chunjiang Li; Yueming Jin (CoRR, 2026)