Returns the call by its call_uuid OR its id (the DB call-record id / ${call.id} token), during OR after the call — reads the live dialer_call_attempts record (seeded at dial time), falls back to the finalized CDR after hangup, and adds live channel state while up. The id field is the database call-record id (the value carried by the transfer-destination ${call.id} token). Requires calls:read.