0.1.6

• Keep impact culling bounds tied to the ground surface after the Nail pierces downward, including small Nails with high crater power.
• Expose the complete Nail visual bounds to native entity culling consumers on 1.20.1 and 1.21.1 (26.1.2 already uses renderer bounds) throughout summoning, descent, impact, embedding and removal.
• Extend packaged Sodium Extras absent/present tests with grounded monuments, real ground occlusion, vertical/horizontal cutoff cameras, angle cases and invisible controls. Preserve ordinary entity culling and user whitelists.