There is now a pre-commit to run ruff-format

But the source code isn't currently formatted

This means if you work on a file, it'll be auto-formatted and so any formatting changes get mixed up with functional changes, making code reviews much harder.

I think we should run format over the whole code base, so that the formatting change is done in a single commit

This commit can then be added to:

.git-blame-ignore-revs

Which will hide it from git blame and the GitHub UI (I think)