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ci: refresh Windows ARM64 toolchain pins - #135
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The Windows ARM64 architecture gate exposed two upstream toolchain changes:
15cd4ace652427465c7c576bad4aede2b8519cb6b59b190c9a22862cf57e7924for the rebuilt full Windows ARM64 installer. The fail-closed check correctly rejected the old digest before running Rivet.windows-11-armimage carries Visual Studio 18, whose generic MSBuild executable selectedHostX86\arm64despitePreferredToolArchitecture=x64. The 32-bit compiler exhausted its address space on WinUI generated sources (C3859/C1076). Rivet now prefersBin\amd64\MSBuild.exe, including when generic MSBuild is already on PATH, while retaining the generic executable as a fallback.The installer URL and checksum verification remain unchanged. Unit coverage exercises stable/fallback Visual Studio layouts and PATH discovery.
Local validation:
raco test tests/windows-tools.rkt tests/doctor.rkt(34 tests passed); direct discovery selects the amd64 MSBuild executable.Official Racket checksum: https://download.racket-lang.org/releases/9.3/