CLAUDE CODE SKILL · AUTO-OPTIMIZER 达尔文.skill DARWIN · SKILL 让 skill 自主进化 像训练模型一样优化你的 Agent Skill 9-dim evaluation · ratchet mechanism · 2,864 stars · MIT open source Inspired by Karpathy's autoresearch · A ratchet that only turns forward SCORE PROGRESSION 40 55 68 80 92 评估 → 改进 → 实测 → 保留/回滚