2026.11.9.1: targets and providers; a platform defines rows; mcpp#911 G1–G12, B1–B3; tests are mtest's - #912

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/