这段脚本跑起来就是 python convert.py ，它会遍历 input/ 下所有 .mmd ，逐个转成 PNG 放到 output/ ，然后检查文件大小。 为什么要校验大小？ 因为 mermaid-cli 有时候语法错误不会返回非零退出码，但会生成一个几乎空白的图，文件大小只有几百字节。

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