We currently have bespoke use of mw.notify for some completions of checks, but it has to be manually added for every time.

We should consider whether this should be standardized:

• Default text for checks that don't override them?
• Standard "you declined, thanks for participating" text? Or only on success?
• Use something more integrated into the check than mw.notify?

If it's standard, should it be possible to turn off?