STream3R: Scalable Sequential 3D Reconstruction with Causal Transformer - LAN, Yushi; Luo, Yihang; Hong, Fangzhou; Zhou, Shangchen; Chen, Honghua; Lyu, Zhaoyang; DAI, Bo; Yang, Shuai; Loy, Chen Change; Pan, Xingang (International Conference on Learning Representations, 2026)