The inverted-seed P2 regex treated optional "times" as optional, so
additive "8 more" on multi-entity zoo case 0361 extracted as pure S1 and
the three-gate corridor emitted 1.125 vs gold 114.0 (wrong≠0).
- Require explicit multiplicative surface (times as many / twice the …)
- Fail-closed purity gate: multi-clause markers, multi-numeric, multi-mult
- Regression tests for 0361 and bare "N more"
- measure --mode full-holdout-wrong0 over all 500 holdout cases
[Verification]: full-holdout emit_ok=9 wrong=0 refused=491; unit 37 passed
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