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Tossing this up for anybody who might like it. I'll keep this going, most likely, but the defaults are likely to be changed to suit my preferences. No semantic versioning, as this is a live tool I'm using and deploying via github, so it'll be date versioned.
I've noticed a bug where occasionally resizing fails. As I run it against a large library, I'll grab a file or two for reproducible cases and fix it.