Maybe check for GUARD_WAIT circuit readiness whenever a guard fails
Right now we check whether any GUARD_WAIT circuits can become usable (OPEN) once a second or so, in circuit_upgrade_circuits_from_guard_wait(). But maybe we should do so more often -- possibly, whenever a guard is marked as down?
This would make some streams attach up to one second faster -- but only in the cases when primary guards are down but we expected them to be up.
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