Track item updatedBy as readonly metadata and inspect field

client/src/items/itemRegistry.ts

@@ -184,6 +184,7 @@ export function getInspectItemPropertyKeys(item: WorldItem): string[] {
     'carrierId',
     'version',
     'createdBy',
+    'updatedBy',
     'createdAt',
     'updatedAt',
     'capabilities',

client/src/network/protocol.ts

@@ -7,6 +7,7 @@ export const itemSchema = z.object({
   x: z.number().int(),
   y: z.number().int(),
   createdBy: z.string(),
+  updatedBy: z.string(),
   createdAt: z.number().int(),
   updatedAt: z.number().int(),
   version: z.number().int(),

client/src/state/gameState.ts

@@ -11,6 +11,7 @@ export type WorldItem = {
   x: number;
   y: number;
   createdBy: string;
+  updatedBy: string;
   createdAt: number;
   updatedAt: number;
   version: number;