Null-Space Filtering for Data-Free Continual Model Merging: Preserving Stability, Promoting Plasticity - Qiu, Zihuan; Wang, Lei; Cao, Yang; ZHANG, Runtong; Su, Bing; Xu, Yi; Meng, Fanman; Xu, Linfeng; Wu, Qingbo; Li, Hongliang (International Conference on Learning Representations, 2026)