Migrate `changetool` to `pr-checks` - #4128

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mbg wants to merge 3 commits into

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mbg/move-changetool

Commits on Sep 9, 2026

Migrate `changetool` to `pr-checks`
mbg
committed
83d1431
Fix some formatting in `pr-checks.yml`
mbg
committed
b136352
Address linter errors in `validate.test.mts`
mbg
committed
d235931