Fix PyPI upload failures from colliding macOS wheel artifacts - #137
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macos-latest (macOS 26) and macos-15 are both arm64, so with CIBW_ARCHS_MACOS=auto64 both jobs produced identically named *-macosx_11_0_arm64.whl files with different contents. The publish job extracted both artifacts into dist/ via merge-multiple, letting two concurrent writers target the same path. The resulting wheels had local file headers disagreeing with the central directory, which PyPI rejects with "Invalid distribution file. ZIP archive not accepted: Mis-matched data size". - Drop the duplicate macos-15 matrix entry. - Download each artifact into its own subdirectory and fail loudly if two build jobs emit the same distribution name. - Replace the zipfile.testzip() check, which only reads the central directory, with the structural checks PyPI actually applies: local header vs central directory name/CRC/sizes, no data descriptors, and no trailing data after the end-of-central-directory record.
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macos-latest (macOS 26) and macos-15 are both arm64, so with CIBW_ARCHS_MACOS=auto64 both jobs produced identically named *-macosx_11_0_arm64.whl files with different contents. The publish job extracted both artifacts into dist/ via merge-multiple, letting two concurrent writers target the same path. The resulting wheels had local file headers disagreeing with the central directory, which PyPI rejects with "Invalid distribution file. ZIP archive not accepted: Mis-matched data size".