phase: 20.49 COMPLETE; 20.50 Flow+String minimal reps; 20.51 selfhost v0/v1 minimal (Option A/B); hv1-inline binop/unop/copy; docs + run_all + CURRENT_TASK -> 21.0

tests/development/test_override_validation.hako

@@ -0,0 +1,48 @@
+// 🔍 override検証テスト - デリゲーションメソッドチェック機能
+
+// 1. ✅ 正常なoverride（基本テスト）
+box Animal {
+    init { name }
+    
+    pack(animalName) {
+        me.name = animalName
+    }
+    
+    speak() {
+        return me.name + " makes a sound"
+    }
+    
+    move() {
+        return me.name + " moves"
+    }
+}
+
+box Dog from Animal {
+    init { breed }
+    
+    pack(dogName, dogBreed) {
+        from Animal.pack(dogName)
+        me.breed = dogBreed
+    }
+    
+    // ✅ 正常なoverride - speakメソッドは親に存在
+    override speak() {
+        return me.name + " (dog) barks: Woof!"
+    }
+    
+    // ✅ 正常なoverride - moveメソッドも親に存在
+    override move() {
+        return me.name + " runs fast"
+    }
+}
+
+// テスト実行
+print("=== 🔍 Override検証テスト ===")
+
+local dog
+dog = new Dog("Buddy", "Labrador")
+print("Dog speak: " + dog.speak())
+print("Dog move: " + dog.move())
+
+print("")
+print("✅ 正常なoverrideテスト完了！")