Can't correct `isnt'` into `isn't` without leaving a residual apostrophe → `isn't'`

https://github.com/user-attachments/assets/805f6efa-91c6-4596-a560-896350123adc

This is because Harper doesn't treat trailing apostrophes as part of the word. Which is reasonable since the `'` apostrophe is ambiguous meaning "apostrophe", "opening single quote", or "closing single quote". And even `’` is ambiguous meaning "apostrophe" and "closing single quote".

A dedicated linter would be able to check for any out-of-vocabulary word immediately followed by `'` or `’` and/or a list of all contractions where the `'` is the penultimate character given that `wont'` and `cant'` might be this same mistake.

This will surely clash with `SpellCheck`, so we really need to find a more architectural solution to clashing linters when ignoring one of them can result in ignoring the fix.

Start by reproducing the `isnt'` correction and examine how the spell-check and other linters report or suppress fixes. Done should mean correcting the malformed contraction removes the residual apostrophe while preserving valid spell-check and linter fixes; the issue does not name a file or test to run.

Written by the indexing model from the issue text.