Follow-on to ADR-0163 §F that corrects the metric exposed by the overfitting
finding (96/150 synthetic flips vs 1/50 real; the 0002 cable/fraction problem read
as accumulation -> 996). Specs a small, hand-curated, real-sourced set of hard
negatives + near-miss confusers (disguised-polarity verbs, pseudo-accumulation
fractions, multi-referent/multi-actor, distractor quantities, temporal/question-
scope, comparative-referent, unit confusers) with minimal-pair construction.
Scored the opposite way from a coverage lane: success = wrong=0 on confusers +
pair-consistency + honest refusal frontier, NEVER solved-count. Held-out by
contract (not a training-to-fit target); the CP ledger consumes the wrong attempts
as the hard negatives the templated corpus lacked. Guardrails forbid reactive vocab
growth and template expansion.
