Vendored unmodified from https://github.com/blader/humanizer
Commit: 9862685f575c65a8247f90369951df1b3416e3d6 (v3.0.0)

To update, copy SKILL.md and LICENSE from a newer commit, review the diff, and
bump the commit above. Keep RomM-specific rules in pr-ready, and check that the
pattern names its "Step 5 scope" section cites still exist.
