ci: cache Windows vcpkg binaries - #225
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Summary
vcpkg.jsonMotivation
The Windows vcpkg job currently rebuilds GMP and MPFR on every fresh hosted runner. That adds roughly 15 minutes during CMake configure. This spike keeps the existing build, check, install, and consumer smoke coverage unchanged while testing whether a persisted vcpkg binary cache removes that cost.
Validation
git diff --checkpasses