fix(process): copy info slices defensively

process.go

@@ -49,7 +49,7 @@ func (p *Process) Info() Info {
 	return Info{
 		ID:        p.ID,
 		Command:   p.Command,
-		Args:      p.Args,
+		Args:      append([]string(nil), p.Args...),
 		Dir:       p.Dir,
 		StartedAt: p.StartedAt,
 		Running:   p.Status == StatusRunning,

process_test.go

@@ -28,6 +28,23 @@ func TestProcess_Info(t *testing.T) {
 	assert.Greater(t, info.Duration, time.Duration(0))
 }
 
+func TestProcess_InfoSnapshot(t *testing.T) {
+	svc, _ := newTestService(t)
+
+	proc, err := svc.Start(context.Background(), "echo", "snapshot")
+	require.NoError(t, err)
+
+	<-proc.Done()
+
+	info := proc.Info()
+	require.NotEmpty(t, info.Args)
+
+	info.Args[0] = "mutated"
+
+	assert.Equal(t, "snapshot", proc.Args[0])
+	assert.Equal(t, "mutated", info.Args[0])
+}
+
 func TestProcess_Output(t *testing.T) {
 	t.Run("captures stdout", func(t *testing.T) {
 		svc, _ := newTestService(t)

service.go

@@ -157,9 +157,9 @@ func (s *Service) StartWithOptions(ctx context.Context, opts RunOptions) (*Proce
 	proc := &Process{
 		ID:          id,
 		Command:     opts.Command,
-		Args:        opts.Args,
+		Args:        append([]string(nil), opts.Args...),
 		Dir:         opts.Dir,
-		Env:         opts.Env,
+		Env:         append([]string(nil), opts.Env...),
 		StartedAt:   startedAt,
 		Status:      StatusRunning,
 		cmd:         cmd,