Open groups for publishers

As a publisher I want to have authoritative, open, named groups that show on my site, that anyone can read or write but that I can moderate, so that I can separate distinct conversations into their own spaces and prevent abuse.

No files, tests, or entry points are mentioned. Start by reviewing the publisher, group, moderation, and access-control requirements, then clarify the product and technical design before implementation. Done means authoritative named groups can be displayed on a publisher site, read or written by anyone, moderated by the publisher, and used to separate conversations.

Written by the indexing model from the issue text.