HUB: POST /api/reception/apply with a proposed id, role, harness and capabilities; an operator reviews and admits, and no agent self-admits. SHAREPOINT: the Access Requests list - a built-in list where a request to join sits pending until an owner approves, which then grants membership. It is an exact match, down to the human-in-the-loop, and it is the single most satisfying correspondence in this whole document: a mechanism the hub built maps to a list SharePoint has shipped for twenty years. STATUS: MISSING. Depends on groups existing at all (EST.23), because admission means being added to a group and we have no group concept yet.