fix: make forceKillDelay testable to prevent signal test timeout

将 forceKillDelay 从常量改为变量，在 TestRun_LoggerRemovedOnSignal 中设为 1 秒。
防止测试等待 3 秒超时，而子进程需要 5 秒才能被强制杀死的竞态条件。

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

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

codex-wrapper/main.go

@@ -24,7 +24,6 @@ const (
 	version            = "4.8.2"
 	defaultWorkdir     = "."
 	defaultTimeout     = 7200 // seconds
-	forceKillDelay     = 5    // seconds
 	codexLogLineLimit  = 1000
 	stdinSpecialChars  = "\n\\\"'`$"
 	stderrCaptureLimit = 4 * 1024
@@ -41,6 +40,7 @@ var (
 	buildCodexArgsFn = buildCodexArgs
 	commandContext   = exec.CommandContext
 	jsonMarshal      = json.Marshal
+	forceKillDelay   = 5 // seconds - made variable for testability
 )
 
 // Config holds CLI configuration

codex-wrapper/main_test.go

@@ -28,6 +28,7 @@ func resetTestHooks() {
 	buildCodexArgsFn = buildCodexArgs
 	commandContext = exec.CommandContext
 	jsonMarshal = json.Marshal
+	forceKillDelay = 5
 	closeLogger()
 }
 
@@ -1286,6 +1287,9 @@ func TestRun_LoggerRemovedOnSignal(t *testing.T) {
 	defer resetTestHooks()
 	defer signal.Reset(syscall.SIGINT, syscall.SIGTERM)
 
+	// Set shorter force kill delay for faster test
+	forceKillDelay = 1
+
 	tempDir := t.TempDir()
 	t.Setenv("TMPDIR", tempDir)
 	logPath := filepath.Join(tempDir, fmt.Sprintf("codex-wrapper-%d.log", os.Getpid()))