Raised by Chimeway.Dispatch.ObanWorker when map_outcome_to_oban_return/4
encounters a (outcome, error_class, status) shape that none of the documented
clauses match AND the in-band convergence guard cannot legally fire (delivery
is not in :failed status, or this is not the final attempt). This is the
loud-failure branch of the BL-02 fix — see Plan 14-10.
The exception carries enough metadata for an operator to reproduce the
scenario and extend either Executor.classify/1 or the documented worker
clauses.