ec5e7556ae
design/06 涵盖四源应力(塑性/热/相变/残余)、扩散松弛、形变阻力、弯曲扭曲与开裂扩展。design/07 涵盖疲劳累积公式、疲劳裂纹、刀具耐久度计算、回火恢复与刀具失效判定。 Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>