Put mob face PNGs in this folder to override generated portraits.

Expected file naming:
- <namespace>_<entity_path>.png
- all lowercase
- examples:
  - minecraft_zombie.png
  - minecraft_skeleton.png
  - minecraft_zombie_villager.png
  - minecraft_wandering_trader.png

Recommended image size:
- 64x64 PNG (square)

Runtime behavior:
- NSEW checks this folder first for each mob.
- If a PNG exists, it is used as the mob profile icon.
- If missing, NSEW falls back to built-in texture crop/recipe rendering.
