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Description
The tox lint check at the end of ci.yml doesn't seem to be showing lint errors.
Add a separate lint action, a ruff configuration, and ruff-format the codebase. The changes are all whitespace, if joining strings can be considered whitespace.
Passing "ruff check" would be more difficult.
Checklist
I've added this contribution to thethere is already an entry about linting, which is sufficient.changelog.md.AUTHORSfile (or it's already there).