Your LuckEnchantmentMixin.java has faulty logic in it. With your mod loaded, I am unable to /enchant playername fortune 3.

    @Override
    public boolean isAcceptableItem(ItemStack itemStack) {
        if (this.type == EnchantmentTarget.DIGGER) {
            return itemStack.getItem() == AlaskaNativeItems.ULU;
        }
        return super.isAcceptableItem(itemStack);
    }

If you follow the logic in your code, it's basically going: "This is a pickaxe! A pickaxe is a Digger! A pickaxe is not an Ulu... So let's return false!"

Fixed in 1.1.0, (by removing it all together)