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* ci: drop boost from 32-bit mingw32 install MSYS2 removed the mingw-w64-i686-boost package (32-bit i686 is being phased out), so the mingw32 matrix entry now fails at the pacman install step with "target not found: mingw-w64-i686-boost". Boost is optional test coverage (boost::optional / boost::variant casters, gated behind PYBIND11_TEST_BOOST); without it those tests are skipped and the rest of the job builds and runs normally. Move boost to the mingw64 extra_install so the 64-bit job keeps that coverage. Assisted-by: ClaudeCode:claude-opus-4.8 * Apply suggestion from @henryiii