- Add missing MSYS2 packages to CI: vulkan-loader, vulkan-headers,
shaderc, stormlib (both x86-64 and arm64), unicorn (arm64)
- Make vulkan-1.dll copy conditional via find_file (fixes MSYS2 builds)
- Use find_library for wininet/bz2 in asset_extract (graceful fallback)
- Add extract_assets.ps1 and extract_assets.bat for Windows users
- Expand BUILD_INSTRUCTIONS.md with MSYS2, vcpkg, and macOS sections
- Update README.md to reference Windows scripts and platforms