Flash-Searcher: Fast and Effective Web Agents via DAG-Based Parallel Execution - Qin, Tianrui; Chen, Qianben; Wang, Sinuo; Xing, He; Zhu; Zhu, He; Shi, Dingfeng; Liu, Xinxin; Zhang, Ge; LIU, JIAHENG; Gao, Xitong; Jiang, Yuchen; et al. (International Conference on Learning Representations, 2026)