test: add regression test for `grind?` dropping `cases` params

This PR adds a regression test for #13828: `grind?` suggestions used to omit `cases` parameters (e.g., `cases Bool`), producing suggestions that failed during replay. The issue was fixed by #14022.

Closes #13828

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
1 file changed