将文章内 Mermaid block 或旧 Mermaid SVG 提取/回源为 .mmd 并转换成 PNG 引用
$npx -y skills add lienjack/learn-agent --skill article-mermaidInstalls into the current project.
Run `npx skills use "https://github.com/lienjack/learn-agent" --skill "lienjack/learn-agent/article-mermaid"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.
Use the skills in "https://github.com/lienjack/learn-agent" that are relevant to the current task. Run `npx skills add "https://github.com/lienjack/learn-agent"` and select the relevant skills, then follow their instructions.