nx_autorig_creature_gate.nx

nx_autorig_creature_gate.nx -- THE ARCHETYPE-FREE PROOF: the SAME one-call auto-rig, with NO hint, rigs a dragon- like quadruped (body + 4 legs + tail + neck) AND a biped (torso + 2 legs + 2 arms + head) and finds each one's limb topology from the VOLUME alone. This is the Infinigen-style everything-is-math requirement (operator 2026-09-05: "quickly auto rig a dragon vs a human vs whatever"): no humanoid template, no archetype flag, no learned model -- a medial-radius field and farthest-point peeling read the creature's own geometry. FIXTURES are watertight CSG unions of boxes through nx_csg_scene (N-ary fold, marching tetrahedra), because two overlapping CLOSED meshes carry internal walls that split the interior (banked lesson from the T fixture); an SDF union has none. Every expected number below is DERIVED from the fixture's own construction (a body built with six appendages must peel six limbs; a leg built to z=-36 mm must be reached below -30 mm), never a magic bar. The anti-vacuity tooth is that the two counts DIFFER: a skeletoniser returning a constant would pass every per-fixture tooth and fail that one. MEASURED (2026-09-05/06): the dragon peeled exactly 6 on every run. The first biped peeled 7, not 5, and TWO stories were refuted by instruments before the third was read off one: not the shoulder ledges (a flush head also gave 7), not the torso corners (the peel arithmetic puts them 1-3 cells inside the claimed cubes) -- the LEAF readout showed the left leg peeled three times down one corner column while the right leg peeled once, and the only asymmetry between two mirrored legs was the plane x=0 they shared (see BP_LEG_X below). A derived count must be derived from the union's real geometry, and a fixture must carry no degenerate shared plane; the shouldered variant stays as a MONOTONE tooth. license_tier: ORIGINAL expect_exit: 0