Class GroupApi

Parse a GroupRef into { source, id }. The source is the segment before the first colon; the id is everything after. Pure string parse — no registry access.

Hard reference for callers that need the registry instance directly — the ContactsController uses this to fire change notifications after CRUD verbs.

The managed Groups that contain BOTH players — the objective circles two members share. Used by renown to scope a signal to the circles it occurred within. Empty when disconnected or no shared managed group.