A Robust and Efficient Multi-Agent Reinforcement Learning Framework for Traffic Signal Control. - Sheng-You Huang; Hsiao-Chuan Chang; Yen-Chi Chen; Ting-Han Wei; I-Hau Yeh; Sheng-Yao Kuan; Chien-Yao Wang; Hsuan-Han Lee; I-Chen Wu (CoRR, 2026)