fix(process): reject nil start context

service.go

@@ -25,6 +25,7 @@ var (
 	ErrProcessNotFound   = coreerr.E("", "process not found", nil)
 	ErrProcessNotRunning = coreerr.E("", "process is not running", nil)
 	ErrStdinNotAvailable = coreerr.E("", "stdin not available", nil)
+	ErrContextRequired   = coreerr.E("", "context is required", nil)
 )
 
 // Service manages process execution with Core IPC integration.
@@ -138,6 +139,9 @@ func (s *Service) StartWithOptions(ctx context.Context, opts RunOptions) (*Proce
 	if opts.Command == "" {
 		return nil, coreerr.E("Service.StartWithOptions", "command is required", nil)
 	}
+	if ctx == nil {
+		return nil, coreerr.E("Service.StartWithOptions", "context is required", ErrContextRequired)
+	}
 
 	id := fmt.Sprintf("proc-%d", s.idCounter.Add(1))
 	startedAt := time.Now()

service_test.go

@@ -90,6 +90,16 @@ func TestService_Start(t *testing.T) {
 		assert.Contains(t, err.Error(), "command is required")
 	})
 
+	t.Run("nil context is rejected", func(t *testing.T) {
+		svc, _ := newTestService(t)
+
+		_, err := svc.StartWithOptions(nil, RunOptions{
+			Command: "echo",
+		})
+		require.Error(t, err)
+		assert.ErrorIs(t, err, ErrContextRequired)
+	})
+
 	t.Run("with working directory", func(t *testing.T) {
 		svc, _ := newTestService(t)
 
@@ -698,6 +708,16 @@ func TestService_RunWithOptions(t *testing.T) {
 		assert.Error(t, err)
 		assert.Contains(t, err.Error(), "exited with code 2")
 	})
+
+	t.Run("rejects nil context", func(t *testing.T) {
+		svc, _ := newTestService(t)
+
+		_, err := svc.RunWithOptions(nil, RunOptions{
+			Command: "echo",
+		})
+		require.Error(t, err)
+		assert.ErrorIs(t, err, ErrContextRequired)
+	})
 }
 
 func TestService_Running(t *testing.T) {