Difficulty is judged in the background: the first-ever occurrence of a hard
prompt routes by prior (often low/medium), the oracle's judgement lands in
the cache a couple of seconds later. The route-judged retry fired instantly
with a FRESH template — which has the same first-encounter fate — so the
test could go red exactly when the system was working as designed. The retry
now re-asks the same prompt after 4s (steady-state answer from the cache),
and only then tries a fresh template.
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