TimeSRL: Generalizable Time-Series Behavioral Modeling via Semantic RL-Tuned LLMs - A Case Study in Mental Health. - Yuang Fan; Lilin Xu; Millie Wu; Jingping Nie; Qingyu Chen 001; Yuzhe Yang 003; Zhuo Zhang; Xin Liu 034; Subigya Nepal; Xiaofan Jiang 001; Xuhai Orson Xu (CoRR, 2026)