2026.9.29.1: a workspace is one graph per configuration; the planning regression of 2026.9.28.3 fixed at its cause - #738

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@v4, actions/checkout@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/