Regulation of clinical Artificial Intelligence (AI) in the Age of Agents: Unconfined Non-Deterministic Clinical Software (UNDCS) systems for healthcare. - Caitlyn Tan; Dinesh Visva Gunasekeran; Cheng Ooi Low; Gabrielle Sze Yee Sim; Danella Yaoxin Foo; Robert J. T. Morris; Tien Yin Wong (npj Digit. Medicine, 2026)