fix(wave-1): ECMA-404 JSON.parse, process exit/rejections, worker Date/exit, CLI flags (v0.10.9) - #65

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/