Protocol shapes: the branch-as-step check reads flat numbered protocols - #592

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@11d5960a326750d5838078e36cf38b85af677262, actions/setup-node@v4, docker/build-push-action@ca052bb54ab0790a636c9b5f226502c73d547a25, docker/metadata-action@c299e40c65443455700f0fdfc63efafe5b349051, docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/