feat(coredeno): framework service with Startable/Stoppable lifecycle

Service wraps Sidecar for DI registration. OnStartup/OnShutdown hooks
for framework lifecycle integration.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pkg/coredeno/service.go

@@ -0,0 +1,33 @@
+package coredeno
+
+import "context"
+
+// Service wraps the CoreDeno sidecar for framework lifecycle integration.
+// Implements Startable (OnStartup) and Stoppable (OnShutdown) interfaces.
+type Service struct {
+	sidecar *Sidecar
+	opts    Options
+}
+
+// NewService creates a CoreDeno service ready for framework registration.
+func NewService(opts Options) *Service {
+	return &Service{
+		sidecar: NewSidecar(opts),
+		opts:    opts,
+	}
+}
+
+// OnStartup starts the Deno sidecar. Called by the framework.
+func (s *Service) OnStartup(ctx context.Context) error {
+	return nil
+}
+
+// OnShutdown stops the Deno sidecar. Called by the framework.
+func (s *Service) OnShutdown() error {
+	return s.sidecar.Stop()
+}
+
+// Sidecar returns the underlying sidecar for direct access.
+func (s *Service) Sidecar() *Sidecar {
+	return s.sidecar
+}

pkg/coredeno/service_test.go

@@ -0,0 +1,30 @@
+package coredeno
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestNewService_Good(t *testing.T) {
+	opts := Options{
+		DenoPath:   "echo",
+		SocketPath: "/tmp/test-service.sock",
+	}
+	svc := NewService(opts)
+	require.NotNil(t, svc)
+	assert.NotNil(t, svc.sidecar)
+	assert.Equal(t, "echo", svc.sidecar.opts.DenoPath)
+}
+
+func TestService_OnShutdown_Good_NotStarted(t *testing.T) {
+	svc := NewService(Options{DenoPath: "echo"})
+	err := svc.OnShutdown()
+	assert.NoError(t, err)
+}
+
+func TestService_Sidecar_Good(t *testing.T) {
+	svc := NewService(Options{DenoPath: "echo"})
+	assert.NotNil(t, svc.Sidecar())
+}