Feature/mesh loader impl - #37

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, ilammy/msvc-dev-cmd@v1, jwlawson/actions-setup-cmake@v1, robinraju/release-downloader@v1.10. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

llvm@19 was installed but not linked because llvm@18 is already installed. To link this version, run: brew link llvm@19