It might make sense to publicly show the linked MediaWiki.org account on the Phabricator user page, so people can associate Phabricator usernames (which do not necessarily match the MediaWiki.org username) with the SUL one.
I am putting this in "Day 1" since if we want to do this, it should be made clear to users logging in with SUL that the association is public. Ideally this notice will be in place when SUL login first works in production.
The actual user page feature ("This account is linked with MediaWiki.org account Foo") does not need to be in place on Day 1, but if we want to do this, it should be clear on Day 1 that the association is public.
See also