Poll a safe lifecycle projection; carrier callbacks and workers remain the only writers.
Admins and Managers may review any inbound receptionist handoff in their tenant. A Rep
receives the same shape only when their server-linked human-rep id is a durable target
of the request. The 404 remains identical for absent and unauthorized rep rows.
The current carrier-confirmed lifecycle of one authorized handoff.
This is intentionally status-only. It contains no carrier operation identifiers,
telephone destination, handoff summary, transcript, recording URL, or media state.
In particular, it is not an action surface: a rep joining the carrier consult remains
the only way an accepted transition can occur.