FeatureBench: Benchmarking Agentic Coding for Complex Feature Development - Zhou, Qixing; Zhang, JiaCheng; Wang, Haiyang; Hao, Rui; Wang, Jiahe; Han, Minghao; Yang, Yuxue; Wu, Shuzhe; Pan, Feiyang; Fan, Lue; Tu, Dandan; Zhang, Zhaoxiang (International Conference on Learning Representations, 2026)