Send notification email to creator

Send an email notification anytime an event happens to the group of the creator. This might make a great deal of traffic, so this is a serious issue if one assigns themselves to it! (Or we might even consider not solving this issue...) #253 is more important, so start with that of course!

Start by reviewing issue #253, which this issue identifies as higher priority, then map how events reach a creator’s group and where email delivery would belong. No files, tests, entry points, or completion criteria are provided; clarify traffic limits and whether the feature should be pursued before implementation.

Written by the indexing model from the issue text.