A Production-Ready RL Framework for Personalized Utility Tuning with Pareto Sweeping in Pinterest Recommender Systems. - Yichu Zhou; Mehdi Ben Ayed; Lin Yang; Jiacong He; Andreanne Lemay; Jiaye Wang; Jaewon Yang; Josie Zeng; Dhruvil Deven Badani; Yijie Dylan Wang; Jiajing Xu 003; Charles Rosenberg 001 (CoRR, 2026)