nx_softdyn_gate.nx

nx_softdyn_gate.nx -- prove the secondary-dynamics solver is REAL PHYSICS, not a wobble hack. T1 INERTIAL LAG soft mass trails an accelerating anchor (that IS jiggle) T2 OVERSHOOT when the anchor stops, the mass passes THROUGH it (sign change) = oscillation T3 DAMPED SETTLE energy decays and it comes to rest (no perpetual motion) T4 IMPULSE/RECOIL a kick on a still point displaces then returns -- the SAME solver serves firearms T5 BOUNDED a violent anchor can never separate tissue past the clamp (divergence impossible) T6 DETERMINISM identical replay, bit-for-bit T7 ANTI-VACUITY a STIFF+damped config shows ~no lag => T1's lag is the SOLVER, not an always-on bug license_tier: ORIGINAL expect_exit: 0