Restructure into cross-platform monorepo: spi module, adapters tree, buildAll

adapters/fabric/src/main/java/art/arcane/iris/fabric/IrisFabricBootstrap.java

@@ -0,0 +1,25 @@
+/*
+ * Iris is a World Generator for Minecraft Servers
+ * Copyright (c) 2026 Arcane Arts (Volmit Software)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package art.arcane.iris.fabric;
+
+public final class IrisFabricBootstrap {
+    public void onInitialize() {
+        throw new UnsupportedOperationException("The Iris Fabric adapter is a build skeleton; worldgen is not wired yet (see CROSSPLATFORM_PLAN.md Phase 4).");
+    }
+}

adapters/fabric/src/main/resources/fabric.mod.json

@@ -0,0 +1,13 @@
+{
+  "schemaVersion": 1,
+  "id": "irisworldgen",
+  "version": "${version}",
+  "name": "Iris",
+  "description": "Iris World Generation Engine (Fabric adapter - SKELETON, worldgen not yet wired)",
+  "authors": ["Arcane Arts (Volmit Software)"],
+  "license": "GPL-3.0",
+  "environment": "server",
+  "entrypoints": {
+    "main": ["art.arcane.iris.fabric.IrisFabricBootstrap"]
+  }
+}