DoubleXP Spartan Aquaculture compatibility fork

Upstream project: Spartan Aquaculture 0.2 for Minecraft 1.20.1
Upstream author: denispionicul
Upstream source: https://gitlab.com/denispionicul/SpartanWeaponryAquaculture2
Upstream license: MIT
Upstream installed JAR SHA-256: 0dd8f463089e346c640a9cceff59eb9dd54da4d582b7dd8b2a41ae88b29a983d

DoubleXP change:
- Added the missing `refmap` declaration to spartanweaponryaquaculture.mixins.json so the already-included upstream refmap is actually used in a production Forge runtime.
- No upstream compiled classes, recipes, item IDs, assets, or gameplay values were changed.
- Internal mod ID remains `spartanweaponryaquaculture` so existing world/item data remains compatible.

This JAR is an explicit replacement/fork. Do not install it alongside the upstream SpartanAquaculture-0.2-1.20.1.jar.
