Key result
CDN-351 converts the CDN-350 strong lead into an external measurement gate yielding EXTERNAL_CORNER_GATE_LOCKED.
The locked external corner gate supplies conservative survival thresholds; leaves open whether mixed sub-threshold caps improve performance in external cohorts.
CDN-351 converts the CDN-350 strong lead into an external measurement gate. The one-axis thresholds c0=11.276973, rho=0.188040, and T=0.615217 are sufficient survival gates, but not necessary cuts, because mixed sub-threshold caps can also cross P(20/20)>=20%. The locked falsifier is the monotone upper-corner rule: for external caps c0<=C, rho<=R, T<=Theta, evaluate the closure model at (C,R,Theta). The locked result is EXTERNAL_CORNER_GATE_LOCKED.
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Nicky Joseph Hubertus Catharina Hacquier (2026) studied this question. CDN-351 was evaluated. CDN-351 converts the CDN-350 strong lead into an external measurement gate, yielding a locked result of EXTERNAL_CORNER_GATE_LOCKED.
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