feat(audio): integrate MicYou DSP, capture-first startup and upstream sync - #1242

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/

The process '/opt/homebrew/bin/git' failed with exit code 128

Due to capacity constraints, jobs targeting macOS arm64 runners may experience longer queue times.