fix(merge): 修复master合并后的编译和测试问题

在重构代码后合并master分支时需要的适配:

1. **接口定义恢复** (executor.go)
   - 添加 commandRunner 和 processHandle 接口
   - 实现 realCmd 和 realProcess 适配器
   - 添加 newCommandRunner 测试钩子

2. **TaskResult扩展** (config.go)
   - 添加 LogPath 字段支持日志路径跟踪
   - 在 generateFinalOutput 中输出 LogPath

3. **原子变量适配** (main.go, executor.go)
   - forceKillDelay 从int改为 atomic.Int32
   - 添加测试钩子: cleanupLogsFn, signalNotifyFn, signalStopFn
   - 添加 stdout 关闭原因常量

4. **功能函数添加**
   - runStartupCleanup: 启动时清理旧日志
   - runCleanupMode: --cleanup 模式处理
   - forceKillTimer 类型和 terminateCommand 函数
   - terminateProcess nil 安全检查

5. **测试适配** (logger_test.go, main_test.go)
   - 将 *exec.Cmd 包装为 &realCmd{cmd}
   - 修复 forwardSignals 等函数调用

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

codeagent-wrapper/main_test.go

@@ -2002,7 +2002,7 @@ func TestRunCodexTask_SignalHandling(t *testing.T) {
 func TestForwardSignals_ContextCancel(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	forwardSignals(ctx, &exec.Cmd{}, func(string) {})
+	forwardSignals(ctx, &realCmd{cmd: &exec.Cmd{}}, func(string) {})
 	cancel()
 	time.Sleep(10 * time.Millisecond)
 }
@@ -3070,13 +3070,13 @@ func TestRunForwardSignals(t *testing.T) {
 		t.Skip("sleep command not available on Windows")
 	}
 
-	cmd := exec.Command("sleep", "5")
-	if err := cmd.Start(); err != nil {
+	execCmd := exec.Command("sleep", "5")
+	if err := execCmd.Start(); err != nil {
 		t.Skipf("unable to start sleep command: %v", err)
 	}
 	defer func() {
-		_ = cmd.Process.Kill()
-		cmd.Wait()
+		_ = execCmd.Process.Kill()
+		execCmd.Wait()
 	}()
 
 	ctx, cancel := context.WithCancel(context.Background())
@@ -3099,6 +3099,7 @@ func TestRunForwardSignals(t *testing.T) {
 
 	var mu sync.Mutex
 	var logs []string
+	cmd := &realCmd{cmd: execCmd}
 	forwardSignals(ctx, cmd, func(msg string) {
 		mu.Lock()
 		defer mu.Unlock()