feat(discovery): add Image and ServiceID fields to Job for swarm support

internal/discovery/discovery.go

@@ -11,10 +11,16 @@ import (
 
 // Job describes a single (project, service, config_files) update to execute.
 type Job struct {
-	Project    string
-	Service    string
-	WorkingDir string
+	Project     string
+	Service     string
+	WorkingDir  string
 	ConfigFiles []string
+	// Image is the full image reference the update request asked for.
+	// Compose jobs ignore it (compose.yml already pins the reference to
+	// pull); Swarm jobs need it to know what to set on the service spec.
+	Image string
+	// ServiceID is the Swarm service ID. Empty for Compose jobs.
+	ServiceID string
 	// Refused is true when the WorkingDir falls outside STACKS_ROOT.
 	// The job is returned so the caller can surface a per-job "refused"
 	// result, but it MUST NOT be executed.
@@ -74,6 +80,7 @@ func (d *Discovery) FindJobs(ctx context.Context, image string) ([]Job, error) {
 			Service:       cl.Service,
 			WorkingDir:    cl.WorkingDir,
 			ConfigFiles:   cl.ConfigFiles,
+			Image:         image,
 			Refused:       refused,
 			RefusedReason: reason,
 		})