ButcherCraft: Farm to Table

# ButcherCraft 0.6.8 – Datapack Transformations

ButcherCraft's processing transformations are now loaded from datapack JSON
resources instead of being registered directly in code.

## New

- Added datapack-backed transformation loading.
- Added reload support for transformation definitions.
- Added structured validation and error reporting for invalid transformation
  resources.
- Added reload-safe registry replacement.
- Migrated the following built-in transformations to datapack resources:
  - Beef grinding
  - Pork grinding
  - Bison grinding
  - Beef Forequarter fabrication

## Improvements

- Transformation content can now be changed without modifying the processing
  engine.
- Invalid datapack content no longer replaces the active working registry.
- Failed reloads preserve the previous valid transformation definitions.
- Added validation for:
  - Duplicate transformation IDs
  - Unknown products
  - Unknown workstation capabilities
  - Unsupported schema versions
  - Malformed JSON
  - Missing or invalid definition fields
- Preserved all existing Grinder and Bandsaw behavior.

## Technical Highlights

- JSON-to-canonical transformation parsing
- Immutable transformation registry assembly
- Atomic active-registry replacement
- Reload-safe failure handling
- Separation between Minecraft integration and the pure Java transformation model
- Expanded datapack and regression testing

## Early Beta Notice

ButcherCraft remains in active development.

This release primarily expands the mod's underlying data-driven processing
system. Existing Grinder and Bandsaw gameplay remains available, while future
updates will use this system to add larger fabrication catalogs and additional
processing workflows.