Semantic registry validation

- Generated registry validation always re-renders recorded semantics with the current fixer
- Validation canonicalizes the rendering like the installer
- Renderer changes need no version bump
- The renderer identity SPI, both identity strings and the identity-based source preference are gone
- New captures record the fixer class as an informational renderer identity
- The v1 history format is unchanged
- The modded forced datapack, world check and datapack command use the runtime data version
- That is the same data version validation uses
- Tests cover a renderer change under an unchanged identity
- Tests cover 26.3 bare natural_mob_spawns history against the overlay rendering
- Tests cover semantic round trips for every supported fixer

adapters/modded-common/src/main/java/art/arcane/iris/modded/ModdedForcedDatapack.java

@@ -314,12 +314,13 @@ public final class ModdedForcedDatapack {
         } catch (NoSuchAlgorithmException missing) {
             throw new IllegalStateException("SHA-256 is unavailable", missing);
         }
+        DataVersion dataVersion = DataVersion.getRuntime();
         digest.update((HASH_SALT + '|' + ModdedEngineBootstrap.loader().platformName()
-                + '|' + DataVersion.V26_3.getPackFormat() + '\n').getBytes(StandardCharsets.UTF_8));
+                + '|' + dataVersion.getPackFormat() + '\n').getBytes(StandardCharsets.UTF_8));
         String inputFingerprint = IrisDatapackCompiler.computeInputFingerprint(
                 compilationPackRoots(),
                 List.of(),
-                DataVersion.V26_3.get(),
+                dataVersion.get(),
                 false
         );
         digest.update(inputFingerprint.getBytes(StandardCharsets.UTF_8));
@@ -328,7 +329,7 @@ public final class ModdedForcedDatapack {
 
     private static void writeStagedPack(Path stagingDirectory) throws IOException {
         Map<String, KSet<String>> seenBiomes = new LinkedHashMap<>();
-        IDataFixer fixer = DataVersion.V26_3.get();
+        IDataFixer fixer = DataVersion.getRuntime().get();
 
         int packCount = 0;
         KList<String> presetIds = new KList<>();
@@ -679,7 +680,7 @@ public final class ModdedForcedDatapack {
     }
 
     static void writePackMeta(Path packDirectory) throws IOException {
-        int packFormat = DataVersion.V26_3.getPackFormat();
+        int packFormat = DataVersion.getRuntime().getPackFormat();
         String json = "{\n"
                 + "  \"pack\": {\n"
                 + "    \"description\": \"Iris world generation biomes and dimension types for installed packs.\",\n"

adapters/modded-common/src/main/java/art/arcane/iris/modded/ModdedGenerationRegistry.java

@@ -9,12 +9,10 @@ import java.util.Objects;
 final class ModdedGenerationRegistry implements PlatformGenerationRegistry {
     private final NativeGenerationRegistry nativeRegistry;
     private final String runtimeIdentity;
-    private final String rendererIdentity;
 
-    ModdedGenerationRegistry(NativeGenerationRegistry nativeRegistry, Identity identity) {
+    ModdedGenerationRegistry(NativeGenerationRegistry nativeRegistry, String runtimeIdentity) {
         this.nativeRegistry = Objects.requireNonNull(nativeRegistry, "nativeRegistry");
-        this.runtimeIdentity = requireText(identity.runtime(), "runtimeIdentity");
-        this.rendererIdentity = requireText(identity.renderer(), "rendererIdentity");
+        this.runtimeIdentity = requireText(runtimeIdentity, "runtimeIdentity");
     }
 
     @Override
@@ -22,11 +20,6 @@ final class ModdedGenerationRegistry implements PlatformGenerationRegistry {
         return runtimeIdentity;
     }
 
-    @Override
-    public String generatedDefinitionRendererIdentity() {
-        return rendererIdentity;
-    }
-
     @Override
     public String customBiomeResourceKey(String identitySha256) {
         return PlatformGenerationRegistry.contentAddressedCustomBiomeResourceKey(identitySha256);
@@ -75,7 +68,4 @@ final class ModdedGenerationRegistry implements PlatformGenerationRegistry {
         }
         return required;
     }
-
-    record Identity(String runtime, String renderer) {
-    }
 }

adapters/modded-common/src/main/java/art/arcane/iris/modded/ModdedPlatform.java

@@ -357,8 +357,7 @@ public final class ModdedPlatform implements IrisPlatform {
             throw new IllegalStateException("Minecraft server is not ready for generation registry capture.");
         }
         return new ModdedGenerationRegistry(NativeModdedServer.registryDefinitions(ModdedEngineBootstrap::currentServer),
-                new ModdedGenerationRegistry.Identity("modded-generation-registry-v1",
-                        "modded-generated-registry-json-v1|minecraft:" + BuildConstants.MINECRAFT_VERSION));
+                "modded-generation-registry-v1");
     }
 
 }

adapters/modded-common/src/main/java/art/arcane/iris/modded/WorldCheckDimensionContract.java

@@ -55,7 +55,7 @@ final class WorldCheckDimensionContract {
     }
 
     static Dimension expectedDimensionContract(IrisDimension dimension) {
-        JSONObject json = new JSONObject(dimension.getDimensionType().toJson(DataVersion.V26_3.get()));
+        JSONObject json = new JSONObject(dimension.getDimensionType().toJson(DataVersion.getRuntime().get()));
         return new Dimension(
                 json.getInt("min_y"),
                 json.getInt("height"),

adapters/modded-common/src/main/java/art/arcane/iris/modded/command/ModdedDatapackCommands.java

@@ -165,7 +165,7 @@ public final class ModdedDatapackCommands {
             IrisDimension dimension = engine.getDimension();
             String json;
             try {
-                json = dimension.getDimensionType().toJson(DataVersion.V26_3.get());
+                json = dimension.getDimensionType().toJson(DataVersion.getRuntime().get());
             } catch (Throwable e) {
                 ModdedIrisLog.error("Iris dimension type generation failed for {}", dimension.getLoadKey(), e);
                 IrisModdedCommands.fail(source, IrisLanguage.plain(ModdedCommandMessages.MODDED_DATAPACK_COMMANDS_DIMENSION_TYPE_GENERATION_FAILED, MessageArgument.untrusted("value", level.name()), MessageArgument.untrusted("value2", String.valueOf(e.getMessage()))));
@@ -187,7 +187,7 @@ public final class ModdedDatapackCommands {
         }
 
         File mcmeta = new File(worldDatapacksFolder(server), WORLD_PACK_NAME + "/pack.mcmeta");
-        int packFormat = DataVersion.V26_3.getPackFormat();
+        int packFormat = DataVersion.getRuntime().getPackFormat();
         String meta = "{\n"
                 + "  \"pack\": {\n"
                 + "    \"description\": \"Iris dimension types derived from the installed Iris packs.\",\n"