The cmake crate building nam-ffi/NeuralAudio panicked with "couldn't determine
visual studio generator" because the Windows job never ran vcvars, so
cmake-rs had no VisualStudioVersion to detect the VS generator from.
Add an ilammy/msvc-dev-cmd step (x64) after the Windows dependency install; it
runs vcvars and exports the env to later steps so the C++ build can configure.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Skyler Lehmkuhl