Need to flag expressions used in active/indicative mood that should be in passive mood.

> this is not llm writing. there's no need **to startle at** the sight of an em-dash

should be

> this is not llm writing. there's no need **to be startled at** the sight of an em-dash

Probably **to be startled by** is more idiomatic, but that would be specific to this expression whereas changing active to passive probably applies to a range of expressions.

I'll try to add others to this issue as I find them.

No files or tests are named. Start with the issue's active-versus-passive examples and review how existing expression checks are organized; done means flagging applicable active constructions, including the reported example, without overgeneralizing to expressions where the passive form is not appropriate.

Written by the indexing model from the issue text.