Completed agents of your company (« ghosts » mode)

The agents GET /floor/state deliberately leaves out: the completed ones, most recently ended first (agents with no end date come last). A route of its own rather than a flag on /floor/state, because that read feeds the reconciliation of the stored floor layout and must never be told about departed agents. Deliberately cheap: one query on the agents table, no org-chart join, hence no managerHumanId — a completed agent holds no position anyway. Capped at 60 rows, with no cursor: this is a look back at the recent past, not an export. Open to any company member — 404 (not 403) when you have no company, exactly like /floor/state.