Custom NPC Trading

Create a trading system for NPCs. This should be a generic and customizable Trading feature (similar to Villagers, and Wandering Traders in Vanilla Minecraft), that any future Custom Mob/NPC can inherit.

This feature should be added into the Abstract Grunt class so that any NPCs that extend AbstractGrunt will also inherit the Trading functionality.

• Similar trading system as Villagers or Wandering Traders.
• Will use Berrys instead of Emeralds for currency when trading.
• Can be a source of Devil Fruits.
• Can be eventually used for Merchant

Sub issues will be created to manage all of the steps that will likely go into this. (This is wayy down the line still)

Edit: Added 7/29/2026

This will eventually be an interface that Abstract classes should pull from and "customize" to their specific NPC type.