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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>