Search, download, create, evaluate, analyze and route reusable agent skills with SkillNet. Use when asked to find or reuse a skill, turn a repo/document/trace into a skill, assess skill quality, build a local skill graph, select skills for a task, or fill a clearly identified capability gap with a reusable skill. 中文：搜索、下载、创建、评估、分析与路由技能。不用于普通代码修改或仅阅读文档。