Move NPC registry to canonical namespace

internal/core/config/file_config_contract_test.go

@@ -639,14 +639,14 @@ pipelines:
     steps:
       - id: identify-npcs
         artifacts:
-          npcs:
-            extract: dnd/npcs
+          npc_registry:
+            extract: dnd/npc-registry
       - id: grounded-events
         references:
-          npcs:
+          npc_registry:
             artifact:
               step: identify-npcs
-              lane: npcs
+              lane: npc_registry
         artifacts:
           spells:
             extract: dnd/spells
@@ -659,8 +659,8 @@ pipelines:
 	if len(profile.Steps) != 2 || profile.Steps[0].ID != "identify-npcs" || profile.Steps[1].ID != "grounded-events" {
 		t.Fatalf("steps = %#v", profile.Steps)
 	}
-	source := profile.Steps[1].References["npcs"]
-	if source.Artifact == nil || source.Artifact.Step != "identify-npcs" || source.Artifact.Lane != "npcs" {
+	source := profile.Steps[1].References["npc_registry"]
+	if source.Artifact == nil || source.Artifact.Step != "identify-npcs" || source.Artifact.Lane != "npc_registry" {
 		t.Fatalf("generated source = %#v", source)
 	}
 }