Added dimension takeover

- IrisDimension borrowedDimensionType reuses an existing registered dimension type instead of generating one
- Pack validation rejects borrowedDimensionType values that are not namespaced registry keys
- Generation contracts record the borrowed type key and capture it as an external registry definition
- Borrowed types bind when the pack min equals the type min_y and the pack top fits, with both ranges in the refusal
- Studio hotload rejects borrowed type changes and the world check validates borrowed ranges
- Forced datapack skips generated types and presets for borrowed dimensions and accepts retained borrowed epochs
- modded.json dimensionTakeovers writes a LevelStem per level key using the irisworldgen:iris generator
- Takeover changes quarantine the level chunk, entity, POI, and Iris data before load and track applied state per world
- Fresh levels adopt generation history with content-addressed biomes instead of legacy aliases
- /iris world takeover <dimension> <pack[:dimension]|off> with help and translations in every locale

probe/src/main/java/art/arcane/iris/probe/HeadlessGenerationHistorySession.java

@@ -41,8 +41,8 @@ final class HeadlessGenerationHistorySession {
         String fingerprint = GenerationPackFingerprint.compute(pack, GenerationPackFingerprint.CURRENT_VERSION);
         GenerationRegistryContract registryContract = GenerationRegistryContractFactory.create(
                 data, dimension, fingerprint, fixer, registries, generationRegistry);
-        String dimensionTypeKey = generationRegistry.dimensionTypeResourceKey(
-                data.getDataFolder().getName(), dimension.getLoadKey(), dimension.getDimensionTypeKey());
+        String dimensionTypeKey = dimension.dimensionTypeResourceKey(
+                generationRegistry, data.getDataFolder().getName());
         GenerationEpoch.DimensionContract dimensionContract = GenerationEpochContractFactory.create(
                 dimension, dimension.getLoadKey(), dimensionTypeKey);
         return new GenerationHistory.FreshCreation(request.worldRoot(), pack, fingerprint, request.seed(),