Deprecate kamotami.zuiku-extension and disallow new installations - #1196

the `default' input appears to be undefined or empty

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02, gabrielfalcao/pyenv-action@a1fc55906be92612782934c70e3985b940bd0165. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/