test: green up after Phase 2 merge for #26\n\n- Fix AST tests (is_override)\n- Align MIR builder test with current If AST\n- Adjust ResultBox API usage in tests\n- Add len() helpers to ArrayBox/BufferBox for tests

tests/development/test_constructor_debug.nyash

@@ -0,0 +1,18 @@
+// コンストラクタデバッグ
+box Test {
+    init { value }
+    
+    Test(v) {
+        me.value = v
+        print("Constructor called with: " + v)
+    }
+    
+    getValue() {
+        return me.value
+    }
+}
+
+local t
+print("Creating Test...")
+t = new Test("hello")
+print("getValue: " + t.getValue())