Ping team-members directly on weekly digest

Team-members aren't receiving a todo when pinged on the Weekly Digest (e.g. this one).

I think this is because the groups included in the comment aren't visible to the Project bot authoring the comment, therefore no todo is created. In fact, it's just a PAT that can be given various levels of access to the project but nothing outside of it. So there's really no alternative but to have it ping people directly, use a bot with a wider scope, or share someone's access token and have it create comments as them.

The first option requires more maintenance but is less likely to leak a token!