feat(metamodel)!: ADR-0052 — a template subtype's axis is DIRECTION (all 5 ports) - #318

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/