Horizon now targets Linux and macOS only: remove the Windows CI runners and
wgpu's DX12 backend, and update the scope docs. The Ubuntu RTX 4080 desktop
becomes the first physical Linux target. tools/package_native_client.py bundles
a release build with its prepared resources and a launcher for playing on
another machine of the same platform.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Ludovic Marie