feat(01): plugin manifest and entry class

src/main/java/com/mythlane/gravityflip/GravityFlipPlugin.java

@@ -0,0 +1,33 @@
+package com.mythlane.gravityflip;
+
+import com.hypixel.hytale.server.core.plugin.JavaPlugin;
+import com.hypixel.hytale.server.core.plugin.JavaPluginInit;
+
+import java.util.logging.Level;
+
+/**
+ * Entry point for the Gravity Flip plugin.
+ *
+ * <p>Extends {@link JavaPlugin} from the resolved Hytale Server API
+ * ({@code com.hypixel.hytale:Server:2026.03.26-89796e57b}). The lifecycle
+ * hooks in this API version are {@code setup()} and {@code shutdown()}
+ * (NOT {@code onEnable()} / {@code onDisable()}, which belong to older
+ * docs). See {@code .planning/phases/01-scaffold-load/JAVAPLUGIN_RESOLUTION.md}
+ * for the empirical resolution.
+ */
+public class GravityFlipPlugin extends JavaPlugin {
+
+    public GravityFlipPlugin(JavaPluginInit init) {
+        super(init);
+    }
+
+    @Override
+    protected void setup() {
+        getLogger().at(Level.INFO).log("Gravity Flip enabled");
+    }
+
+    @Override
+    protected void shutdown() {
+        getLogger().at(Level.INFO).log("Gravity Flip disabled");
+    }
+}

src/main/resources/manifest.json

@@ -0,0 +1,11 @@
+{
+  "group": "com.mythlane",
+  "name": "hytale-gravity-flip",
+  "version": "0.1.0",
+  "serverVersion": "2026.03.26-89796e57b",
+  "description": "Inverted gravity zones defined via an in-game wand.",
+  "authors": [
+    { "name": "Mythlane" }
+  ],
+  "main": "com.mythlane.gravityflip.GravityFlipPlugin"
+}