nx_legalsem_gate.nx

nx_legalsem_gate.nx -- INDEPENDENT GATE: concept-level (paraphrase) clause matching + POLARITY. INHERITS nx_gate_verdict (D001) so nx_gate_green can judge it and it records a harness.jrnl frame. The teeth: u2605PARAPHRASE WORKS: "indemnify and hold harmless" vs "defend against claims" share almost no words -- word-level matching scores them unrelated -- but they invoke the SAME legal concept and match here. u2605u2605NEGATION IS NOT SEMANTIC NOISE: "shall indemnify" and "shall NOT indemnify" invoke IDENTICAL concepts and score 1000 overlap. That is exactly where dense vector embeddings fail on contracts. The reversal detector is BITE-PROVEN: it must FIRE on the inverted clause and stay SILENT on a genuine paraphrase -- a detector that cannot distinguish those is not a detector. u2605NO VACUOUS AGREEMENT: two texts invoking no known concept are not "identical". license_tier: ORIGINAL No hw writes (Rule 26). expect_exit: 0