Every failed auxiliary model_route row read error_class=unknown because the
aux logical scope only carried outcome/model/provider and the projection
hard-coded unknown for any non-success. Every exception escaping call_llm,
including Hermes' own aborts (Ctrl+C / /stop mid-compression, interrupted
aux streams, task cancellation), was recorded as failed.
- classify the error that ended an aux call (and the last one a successful
call recovered from) with agent.error_classifier; HTTP-200 bodies that
carry a provider error object are classified from that object
- Hermes aborts (non-Exception BaseExceptions, InterruptedError) close the
call as cancelled/none, matching the contract
- MoA aggregator streams report the same way
- aux calls that finish under the turn's own live scopes (title generation
runs beside the turn) were never counted: the scope could not be popped
and the turn-close drain closed it as an orphan without a route. The
drain now closes it with the stored real result.
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