PivotRL: High Accuracy Agentic Post-Training at Low Compute Cost. - Junkeun Yi; Damon Mosk-Aoyama; Baihe Huang; Ritu Gala; Charles Wang; Sugam Dipak Devare; Khushi Bhardwaj; Abhibha Gupta; Oleksii Kuchaiev; Jiantao Jiao; Jian Zhang; Venkat Srinivasan (CoRR, 2026)