Update Eigen integration and replace `gsl::not_null`.#205

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matthew-mccall merged 3 commits intoopen-algebra:masterfrom

matthew-mccall:feature-cmake-find-pkg

Mar 17, 2026

Commits on Mar 17, 2026

Update Eigen integration and replace `gsl::not_null` with `gsl_lite::not_null`. Standardize dependency management and improve code consistency.
matthew-mccall
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[Actions] Format CMakeLists.txt
github-actions
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Update GitHub Actions to use latest versions of actions/checkout and actions/setup-python
matthew-mccall
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