The mod creates these helper skin files on first client launch:
config/FoodVendor/skins/shop_assistant.png
config/FoodVendor/skins/mini_shop_assistant.png

Both use the 64x64 wandering-trader texture layout and are initially copied
from Minecraft's active wandering-trader texture. Edit either PNG and press
F3+T to apply it. If a file cannot be loaded, that helper uses the active
vanilla wandering-trader texture instead.
