docs: README 同步架构演进（地址空间两域，builtin/扩展 rwir 分离） - #23

The strategy configuration was canceled because "build.ubuntu-latest" failed

Process completed with exit code 1.

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, actions/setup-go@v5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/