ci: add pr harness check - #31

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Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: 1password/load-secrets-action@581a835fb51b8e7ec56b71cf2ffddd7e68bb25e0. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/