Integrate artifact locks into publish

internal/stage/stage.go

@@ -35,10 +35,6 @@ type Env struct {
 	Scriptorium scriptorium.Runner
 	ObjectStore storage.ObjectStore
 	Notifier    notify.Sender
-
-	// RevalidatePublishLocks returns the effective lock set immediately before a
-	// publish commit selects a new remote snapshot.
-	RevalidatePublishLocks func(context.Context) ([]config.PublishLockRule, error)
 }
 
 // Stage is the pipeline unit contract.