CSCBench: A PVC Diagnostic Benchmark for Commodity Supply Chain Reasoning. - Yaxin Cui; Yuanqiang Zeng; Jiapeng Yan; Keling Lin; Kai Ji; Jianhui Zeng; Sheng Zhang; Xin Luo; Binzhu Su; Chaolai Shen; Jiahao Yu (CoRR, 2026)