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

local_tests/test_simple_array.hako

@@ -0,0 +1,27 @@
+// ArrayBox length問題の緊急調査
+static box ArrayDebugTest {
+    init { arr }
+    
+    main() {
+        print("=== ArrayBox緊急デバッグ ===")
+        
+        // ArrayBox作成
+        me.arr = new ArrayBox()
+        print("作成直後のlength: " + me.arr.length().toString())
+        
+        // 要素追加
+        me.arr.push("test1")
+        print("push後のlength: " + me.arr.length().toString())
+        
+        me.arr.push("test2")
+        print("2個目push後のlength: " + me.arr.length().toString())
+        
+        // 直接的なテスト
+        local newArr
+        newArr = new ArrayBox()
+        newArr.push("direct")
+        print("新しい配列のlength: " + newArr.length().toString())
+        
+        return "debug完了"
+    }
+}