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_filebox_methods.hako

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+// FileBox v2プラグイン メソッドテスト
+print("=== FileBox Methods Test ===")
+
+// FileBoxを作成
+print("\n1. Creating FileBox...")
+local fileBox
+fileBox = new FileBox()
+print("✅ FileBox created: " + fileBox.toString())
+
+// ファイルを開く
+print("\n2. Opening file for writing...")
+local success
+success = fileBox.open("test_output.txt", "w")
+print("✅ File opened: " + success.toString())
+
+// ファイルに書き込む
+print("\n3. Writing to file...")
+local writeResult
+writeResult = fileBox.write("Hello from Nyash FileBox v2!\n")
+print("✅ Written bytes: " + writeResult.toString())
+
+// もう一行書き込む
+writeResult = fileBox.write("Everything is Box! 🎉\n")
+print("✅ Written more bytes: " + writeResult.toString())
+
+// ファイルを閉じる
+print("\n4. Closing file...")
+local closeResult
+closeResult = fileBox.close()
+print("✅ File closed: " + closeResult.toString())
+
+// ファイルを読み込みモードで開く
+print("\n5. Opening file for reading...")
+success = fileBox.open("test_output.txt", "r")
+print("✅ File opened for reading: " + success.toString())
+
+// ファイル内容を読む
+print("\n6. Reading from file...")
+local content
+content = fileBox.read()
+print("✅ File content:")
+print(content)
+
+// 最後にファイルを閉じる
+print("\n7. Closing file again...")
+closeResult = fileBox.close()
+print("✅ File closed: " + closeResult.toString())
+
+print("\n=== Test completed successfully! ===")