windows/CMakeLists.txt repeated the mpv-build key, asset base, and both
SHA-256 values that mpv-build.lock.json already owns, and the pin mover
never touched it, so a lock bump left Windows silently stale. CMake now
reads artifacts.windows with string(JSON) (floor raised to 3.19) and the
Windows native cache key hashes the lock; a workflow guard rejects
hand-pinned checksums.
The byte-identical Linux libmpv fetch heredoc in build.yml and ci.yml
moves to scripts/fetch_linux_libmpv.py, which verifies the checksum
before extracting and is what the packaging script now points local
builds at. The package-windows and release jobs and
linux/packaging/build-packages.py read the version through
scripts/pubspec_version.py instead of three looser regexes.
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