npm 12 - blocks lifecycle scripts

Situation

The npm 12.0.0 changelog states:

Dependency lifecycle scripts are now blocked by default unless allowed by the root package's allowScripts policy. After installing, run npm install-scripts approve to record approvals and npm rebuild to execute newly approved scripts.

This also affects global installs.

Using npm install -g citgm, as specified in the README > Installation section, blocks the installation of yarn@1.22.22 preinstall.js.

Steps to reproduce

Ubuntu 24.04.4 LTS, Node.js 24.19.0, initially with npm 11.17.0

npm install -g npm@12.0.2
npm install -g citgm@10.0.2

Logs

$ npm install -g citgm@10.0.2
npm warn deprecated uid-number@0.0.6: This package is no longer supported.
npm warn deprecated normalize-git-url@3.0.2: This package is no longer supported.

added 152 packages in 23s

42 packages are looking for funding
  run `npm fund` for details
npm warn install-scripts 1 package had install scripts blocked because they are not covered by allowScripts:
npm warn install-scripts   yarn@1.22.22 (preinstall: :; (node ./preinstall.js > /dev/null 2>&1 || true))
npm warn install-scripts
npm warn install-scripts Run `npm install -g --allow-scripts=yarn` to allow these scripts once, or `npm config set allow-scripts=yarn --location=user` to allow them for all global installs.

Suggestion

Review the impact of this issue:

1. The preinstall.js script of Yarn Classic relates to Corepack. The install-scripts warning should be documented in the README, either with a note that it can be ignored or instructions on how to work around it.
2. Consider dropping yarn@1 which is unsupported. Yarn v1 Classic package manager has been frozen since the release of Yarn 2 in January 2020 and is unsupported since then. It does not meet the general criteria for inclusion into citgm, which require supportability of components used / tested.

Start with the README's Installation section and the citgm dependency setup referenced by the npm install -g citgm@10.0.2 reproduction. Review how Yarn Classic is included and how npm 12 blocks its preinstall.js script. Done means documenting the warning and workaround, or removing the unsupported yarn@1 dependency if that is the chosen resolution.