I extended the recent 67.25007% zeta bound to 67.28470% in Lean

说明与用途

将 Lean 中最近的 67.25007% zeta 上限扩展到 67.28470%，提升了数学证明的精度。使用时只需在 Lean 项目中导入该模块，替换旧的上限，并运行现有证明以验证正确性。生产就绪度为中等：项目活跃，但在正式部署前需手动检查兼容性并更新依赖。

I extended the recent 67.25007% zeta bound to 67.28470% in Lean may be useful when its README and activity match a concrete workflow.

Medium: useful for prototypes or internal workflows, with dependency and maintenance checks before production.