nx_autorig_mesh_gate.nx

nx_autorig_mesh_gate.nx -- proves the one-call auto-rig is FAITHFUL, not a new arithmetic. A bare prism goes through nx_autorig_mesh in one call and, SEPARATELY, through cs_run then bh_run by hand; the two skeletons and the two skinned rigs must be BYTE-IDENTICAL, so this organ only adds an entry point. It also proves the one call actually produced a rig (VERT+TRIS+SKEL+SKIN, weights summing to the NXA 4096 at every vertex -- the anti-vacuity tooth: a no-op that copied the mesh would carry no SKIN) and that a volumeless sheet is refused by name at the skeleton stage. SUBJECT: nx_autorig_mesh via amesh_run, in-process. license_tier: ORIGINAL expect_exit: 0