feat: Flag mixing up "do" and "due"

I'll maintain a list of examples I've found in the wild here:
- you should be able to make **due** with just the Command-Line Tools component → you should be able to make **do** with ...

Search the codebase for existing grammar rules and the reported "due" example, then trace how rules detect word substitutions. Confirm the intended "do" versus "due" cases from the issue's example list and add coverage for the reported wording; done means the checker flags the incorrect form without introducing the reverse false positive.

Written by the indexing model from the issue text.