hermes doctor validated model.provider but never the auxiliary blocks, so a
task whose provider could not be resolved (and therefore silently ran on the
main model) passed as healthy. The config check now runs each routed block
through resolve_runtime_provider — the entry point the tasks themselves use —
and turns a resolver error into a finding with the resolver's reason; the
green line shows the resolved provider@host so a block that fell to the public
default endpoint is visible too. Docs: the openai direct-API alias, its
endpoint precedence, and the new warning/doctor behaviour.
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