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_random_box.hako

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+// 🎲 RandomBoxのテスト
+
+print("=== RandomBox Test ===")
+local random, result, array
+
+// RandomBox作成
+random = new RandomBox()
+
+// 基本乱数テスト
+result = random.random()
+print("Random float: " + result)
+
+result = random.randInt(1, 6)
+print("Dice roll (1-6): " + result)
+
+result = random.randBool()
+print("Random bool: " + result)
+
+// 配列テスト
+array = new ArrayBox()
+array.push("apple")
+array.push("banana") 
+array.push("cherry")
+
+result = random.choice(array)
+print("Random choice: " + result)
+
+// 文字列生成テスト
+result = random.randString(5)
+print("Random string (5 chars): " + result)
+
+print("RandomBox test completed!")