fix: stop the README capture snippet from hiding failed builds - #5

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, actions/setup-python@v5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

No classification: log-path 'never-created.log' does not exist on the runner; the step that writes it may have died before creating it. Capture the failing command like this: `shell: bash` + `your-command 2>&1 | tee build.log` (stderr included, and pipefail keeps the step red).