Restored branch tip decorators

- Branch tip accents occupy the first free outward cell beyond their leaf cluster
- Existing wood leaves and accents retain their positions
- Tests cover opposite branch directions and repeated placement

core/src/test/java/art/arcane/iris/engine/object/tree/TreeDecoratorApplierTest.java

@@ -0,0 +1,45 @@
+package art.arcane.iris.engine.object.tree;
+
+import art.arcane.iris.engine.object.IrisProceduralTree;
+import art.arcane.iris.engine.object.IrisTreeDecorator;
+import art.arcane.iris.engine.object.IrisTreeDecoratorTarget;
+import art.arcane.volmlib.util.collection.KList;
+import org.junit.Test;
+
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+public class TreeDecoratorApplierTest {
+    @Test
+    public void branchTipsExtendOutwardThroughLeavesWithoutReplacingWood() {
+        TreeBlockCanvas canvas = new TreeBlockCanvas();
+        for (int x = -3; x <= 3; x++) {
+            canvas.setTrunk(x, 4, 0, TreeBlockCanvas.Role.TRUNK, TreeBlockCanvas.Axis.X);
+        }
+        canvas.setLeaf(-4, 4, 0, TreeBlockCanvas.Role.LEAF);
+        canvas.setLeaf(4, 4, 0, TreeBlockCanvas.Role.LEAF);
+        IrisTreeDecorator decorator = new IrisTreeDecorator()
+                .setTarget(IrisTreeDecoratorTarget.BRANCH_TIP)
+                .setBlock("minecraft:shroomlight")
+                .setChance(1D)
+                .setAxisAware(true);
+        IrisProceduralTree tree = new IrisProceduralTree();
+        tree.setDecorators(new KList<>(decorator));
+        List<int[]> endpoints = List.of(new int[]{-3, 4, 0, 0, 0}, new int[]{3, 4, 0, 0, 0});
+
+        TreeDecoratorApplier.apply(canvas, tree, 4321L, endpoints);
+
+        assertEquals(TreeBlockCanvas.Role.DECORATOR, canvas.get(-5, 4, 0).role());
+        assertEquals("west", canvas.get(-5, 4, 0).facing());
+        assertEquals(TreeBlockCanvas.Role.DECORATOR, canvas.get(5, 4, 0).role());
+        assertEquals("east", canvas.get(5, 4, 0).facing());
+        assertEquals(7, canvas.getTrunk().size());
+        assertEquals(2, canvas.getLeaf().size());
+        assertEquals(11, canvas.getCells().size());
+
+        TreeDecoratorApplier.apply(canvas, tree, 4321L, endpoints);
+
+        assertEquals(11, canvas.getCells().size());
+    }
+}