TestAddConfig_AllFieldsCovered walks Config by reflection and fails until every
field is either rendered in the debug bundle or listed as excluded with a
reason. The probe marker added for the gate's dry run was neither, so the
client unit suite went red on every platform.
It is excluded: it marks a throwaway copy built to be compared against and
discarded, so it is never set on a config anyone runs with, and rendering it
would only ever print false.