ContextBudget: Budget-Aware Context Management for Long-Horizon Search Agents — Yong Wu, YanZhao Zheng, TianZe Xu, ZhenTao Zhang, YuanQiang Yu, JiHuai Zhu, Chao Ma, BinBin Lin, BaoHua Dong, HangCheng Zhu, RuoHui Huang, Gang Yu | Kutubxona