feat(ax): item 19 screen-reader 纯文本渲染 (无 ANSI 装饰) + 装饰 char 替换 (CC 2.1.208, #109) - #110

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/