nx_autorig_gate.nx

nx_autorig_gate.nx -- prove AUTO-RIG + physics-param EMIT works on every generated object (no per-object hand-authoring). T1 all 8 t2mesh objects rig: spanning tree (bones == parts-1), 0 forced joins, masses > 0. T2 rigs VARY by object (>=5 distinct bone counts). T3 person: 18 parts / 17 bones and the derived root IS the hips (largest volume = pelvis-style root, like real rigs) + every bone has positive length. T4 determinism (two builds byte-identical). T5 NXRG1 pack round-trip + corrupt-reject + person.nxrg written. T6 physical sensibility: dumbbell weights equal mass, heavier than the bar. license_tier: ORIGINAL expect_exit: 0