nx_dr_conductor_gate.nx

nx_dr_conductor_gate.nx -- KAT + neg-control for the Co-Scientist conductor (DR-4). Proves the composed pipeline verify-yield -> Elo tournament -> opp-cost dispatch across 4 research vectors, including the KEY composition result (the highest-QUALITY vector is not the best VALUE once cost is priced in) and the NEG-CONTROL (a zero-support vector loses the tournament, gets zero priority, is ranked LAST, and is never selected). DRY nx_gate_verdict.