Recurrent Complex Volts

https://github.com/Akiak7/RecurrentComplexVolts1.20.1

Recurrent Complex Volts is a staged Minecraft 1.20.1 Forge port of the
legacy Recurrent Complex mod. The current port focuses on preserving the old
Recurrent Complex structure ecosystem: bundled `.rcst` files, user structure
files, missing-mod tolerance, manual placement, worldgen compatibility, and the
first pieces of the creator workflow.

Target

- Minecraft: `1.20.1`
- Forge: `47.4.10`
- Java: `17`
- Mod id: `reccomplex`

Implemented and actively tested:

- legacy `.rcst` loading from bundled resources and `config/reccomplex`;
- missing block fallback to `minecraft:air`;
- safe skipping/degrading of missing items, entities, and unsafe NBT;
- manual commands such as `/rc list`, `/rc check`, and `/rc place`;
- runtime compatibility audit commands with `/rc audit`;
- natural Overworld and Nether worldgen through the deferred compatibility bridge;
- legacy village, decoration/tree, sapling, maze, and script-generation subsets;
- command-side authoring with `/rc select`, `/rc export`, and selection edit commands;
- schematic interchange commands for listing, previewing, converting, and exporting
  Sponge `.schem` plus legacy `.schematic` files;
- first-pass authoring tool items: Block Selector, Floating Block Selector, and Inspector;
- client-side selection outline, floating selector preview, and operation
  preview/confirm/cancel for structure placement and clipboard paste;
- a first modern `/rc gui` browser for browsing structures/schematics,
  launching preview-first operations, making editable config copies, applying
  generation/expression/transformer/metadata presets, and running selection,
  clipboard, export, marker, and script-marker workflows from the Author tab.

Still in progress:

- the full old GUI/editor workflow beyond the current browser, preview launcher,
  generation panel, and Author tab;
- exact 1.12.2 transformer table, placer/dependency expression language, and
  variable-domain parity;
- true modern jigsaw-pool integration for village pieces;
- exact old planned/complemented chunk records for every generation type;
- old GUI-driven schematic conversion screens and rich schematic ghost previews;
- complete modded block/entity/item remapping beyond safe missing-content fallback.