Migrate NPC registry durable contract

internal/modules/dnd/npcs/registry/registry.go

@@ -27,7 +27,7 @@ const (
 // grounding. All accessors return defensive copies.
 type Registry struct {
 	bound            bool
-	list             dnd.NPCList
+	list             dnd.NPCRegistry
 	canonical        []byte
 	digest           string
 	projectionDigest string
@@ -105,7 +105,7 @@ func emptyRegistry() *Registry {
 	content := []byte(emptyPrompt)
 	projectionDigest := semanticDigest(content)
 	return &Registry{
-		list:             dnd.NPCList{NPCs: []dnd.NPC{}},
+		list:             dnd.NPCRegistry{NPCs: []dnd.NPC{}},
 		canonical:        append([]byte(nil), content...),
 		projectionDigest: projectionDigest,
 		promptInput:      contracts.NewLLMInputMaterial(ReferenceSlot, npccodec.MediaType, content, projectionDigest, ""),
@@ -127,7 +127,7 @@ func loadRegistry(referenceContent []byte) (*Registry, error) {
 		return nil, fmt.Errorf("encode canonical NPC registry: approved NPC value could not be encoded")
 	}
 
-	list := cloneNPCList(value)
+	list := cloneNPCRegistry(value)
 	lookupByKey := make(map[string]int, len(list.NPCs))
 	for index, npc := range list.NPCs {
 		lookupByKey[identity.ComparisonKey(npc.Name)] = index
@@ -161,11 +161,11 @@ func (r *Registry) NPCs() []dnd.NPC {
 }
 
 // List returns a defensive copy of the validated NPC list.
-func (r *Registry) List() dnd.NPCList {
+func (r *Registry) List() dnd.NPCRegistry {
 	if r == nil {
-		return dnd.NPCList{}
+		return dnd.NPCRegistry{}
 	}
-	return cloneNPCList(r.list)
+	return cloneNPCRegistry(r.list)
 }
 
 // CanonicalBytes returns a defensive copy of the canonical durable JSON.
@@ -233,12 +233,12 @@ type projectedNPC struct {
 	Name string `json:"name"`
 }
 
-type projectedNPCList struct {
+type projectedNPCRegistry struct {
 	NPCs []projectedNPC `json:"npcs"`
 }
 
-func nameProjection(list dnd.NPCList) ([]byte, error) {
-	projection := projectedNPCList{NPCs: make([]projectedNPC, len(list.NPCs))}
+func nameProjection(list dnd.NPCRegistry) ([]byte, error) {
+	projection := projectedNPCRegistry{NPCs: make([]projectedNPC, len(list.NPCs))}
 	for index, npc := range list.NPCs {
 		projection.NPCs[index] = projectedNPC{Name: npc.Name}
 	}
@@ -254,8 +254,8 @@ func formatIdentityIssues(issues []identity.Issue) string {
 	return diagnostics.Aggregate("validate NPC registry identity", parts)
 }
 
-func cloneNPCList(value dnd.NPCList) dnd.NPCList {
-	return dnd.NPCList{NPCs: cloneNPCs(value.NPCs)}
+func cloneNPCRegistry(value dnd.NPCRegistry) dnd.NPCRegistry {
+	return dnd.NPCRegistry{NPCs: cloneNPCs(value.NPCs)}
 }
 
 func cloneNPCs(values []dnd.NPC) []dnd.NPC {