Generative AI in Architectural Conceptual Design: A Structured Scoping Review of LLMs, Text-to-Image Diffusion Models, Spatial Layout Generation, BIM-AI Coupling, and Human-AI Workflows. - Wang, Yingjie; Li, Tianyu; Zhao, Yuexiao; Zhang, Bo; Huang, Xiaoran (Buildings (2075-5309), 2026)