SERM: Self-Evolving Relevance Model with Agent-Driven Learning from Massive Query Streams. - Chenglong Wang 002; Canjia Li; Xingzhao Zhu; Yifu Huo; Huiyu Wang; Weixiong Lin; Yun Yang; Qiaozhi He; Tianhua Zhou; Xiaojia Chang; Jingbo Zhu; Tong Xiao 001 (CoRR, 2026)