nx_voxel_spec_gate.nx

nx_voxel_spec_gate.nx -- proves the ENGINE EMIT TARGET: a game-SPEC (DATA) -> a generated 3D voxel world, hands-off. Mirrors the dungeon path's "2 distinct specs -> 2 distinct playable games" but for 3D. Two specs (different seed/water/height/camera) -> render_world -> two BMPs. GREEN iff BOTH render a real world AND the two frames DIFFER (distinct data -> distinct world = real generation, not a baked scene). AUTHOR=ORGAN.