fix(exec)+test: 子进程输出显式 UTF-8 解码回归测试；argv 原样传参修复多词参数被字面引号损坏

- 回归测试：/bin/sh -c printf 八进制转义输出「你好」UTF-8 字节，断言
  执行器以 UTF-8 解码正确（Java 源码 \344 须双写为 \\344，否则编译期被
  八进制转义消费）
- 修复 toCommandLine：commons-exec addArgument 默认 handleQuoting=true
  会把含空格参数包进字面双引号存入 argv，sh -c 收到后把整段脚本当成
  单个命令名（exit=127）；改 addArgument(arg, false) 原样传参，
  openclaw message 等多词参数命令由此修复
- 解码路径本身已是显式 UTF-8（new String(toByteArray(), UTF_8)），无需改动

Author: loong10k

src/main/java/io/github/easy4j/openclaw/cli/OpenClawCliExecutor.java

@@ -155,7 +155,10 @@ public CommandLine toCommandLine(OpenClawCliRequest request) {
             cmd.addArgument("--no-color");
         }
         for (String a : request.getArguments()) {
-            cmd.addArgument(a);
+            // handleQuoting=false：子进程经 exec(argv) 启动而非 shell，多词参数
+            // 不需要引号包裹；commons-exec 默认引号会成为 argv 的字面字符，
+            // 导致 sh -c 把整段脚本当成单个命令名。
+            cmd.addArgument(a, false);
         }
         return cmd;
     }

src/test/java/io/github/easy4j/openclaw/cli/OpenClawCliExecutorUtf8DecodeTest.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2018-present, easy-4-java (https://github.com/easy-4-java).
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.github.easy4j.openclaw.cli;
+
+import io.github.easy4j.openclaw.OpenClawCliConfig;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * CLI 子进程输出的字符集解码回归测试：执行器必须以 UTF-8 显式解码子进程输出，
+ * 而不是依赖平台默认字符集（C locale / GBK 环境下中文与 Emoji 会损坏）。
+ *
+ * <p>子进程用 POSIX printf 的八进制转义（{@code \344\275\240\345\245\275}）输出
+ * “你好”的原始 UTF-8 字节。注意：Java 源码里的反斜杠必须双写，否则
+ * {@code \344} 会在编译期被当作八进制转义吃掉。</p>
+ *
+ * @since 1.0.0
+ */
+class OpenClawCliExecutorUtf8DecodeTest {
+
+    @Test
+    void shouldDecodeUtf8OutputRegardlessOfPlatformCharset() {
+        OpenClawCliConfig config = new OpenClawCliConfig();
+        config.setExecutable("/bin/sh");
+        config.setTimeout(10);
+        OpenClawCliExecutor executor = new OpenClawCliExecutor(config);
+
+        OpenClawCliResult result = executor.execute(OpenClawCliRequest.builder()
+                .arguments("-c", "printf '\\344\\275\\240\\345\\245\\275'")
+                .build());
+
+        assertEquals("你好", result.getStdout());
+    }
+}