runs-on: windows-amd64 (home-windows-1, host mode). Build + clippy(-D warnings) + fmt + test the
WinUI 3 client. The toolchain is baked into the runner's daemon env; the workflow only sets
CARGO_WORKSPACE_DIR=${{ github.workspace }} (windows-reactor's build.rs needs it). Triggers on
changes to the windows crate / core / Cargo / this workflow.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
