Inflection-206 Fix missing ICU UTF-16 header includes, C++17/20 CTAD guides, and empty INFLECTION_ROOT path resolution - #207

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache/restore@v4, actions/cache/save@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/