Add lint check to CI

[luisfpereira]

This PR updates CI to check linting.

(Still to early to activate this!)

[gviga]

Hi @luisfpereira,

I've restored this PR and addressed the linting issues:

• ✅ Added missing docstrings to public modules and functions
• ✅ Fixed variable naming conventions (replaced single-letter uppercase variables)
• ✅ Corrected typos in docstrings
• ✅ Ensured all docstrings follow numpy-style conventions

The code now passes Ruff linting checks locally. I believe we're ready to activate these lint checks in the CI workflow.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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