New additions

1) Cave/underground mode (closer follow)

• The NPC now follows the owner closer (~4–5 blocks) when the owner is in a cave/underground.
• Implemented via Role SubState:
  • .Default (surface)
  • .Cave (underground)
• Added the .Cave SubState to Amigo_Follow.json (both copies: normal and _Core).

2) Shorter teleport distance underground

• In cave/underground mode, the hard teleport distance is reduced to 10 blocks.
• On the surface, it goes back to normal (35 blocks).
• Applied to followHard and shouldRescue using:
  • hardTeleportDist = caveMode ? 10.0 : 35.0;

3) Cave/underground detection (best-effort)

• Simple “nearby ceiling” heuristic above the owner:
  • checks blocks 2 to 8 blocks above.
• Tries to avoid false positives from trees:
  • ignores IDs containing leaf/leaves/foliage/vine.
• Cache/controls:
  • reevaluates every ~500ms
  • simple debounce to avoid constant state switching.

4) Level Up audio fix (reliable)

• Level up sound now:
  • tries 2D on the owner
  • if it fails (build/ref variation), falls back to 3D at the owner’s position;
  • if the owner position can’t be resolved, falls back to the NPC position;
  • Level up volume set to 10 dB.
  • Helper created/updated