fix: sync arkUtilVersion with bumped @ark/util package.json

registry.test.ts asserts arkUtilVersion equals the package.json version.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: ssalbdivad

ark/util/registry.ts

@@ -8,7 +8,7 @@ import { FileConstructor, objectKindOf } from "./objectKinds.ts"
 // recent node versions (https://nodejs.org/api/esm.html#json-modules).
 
 // For now, we assert this matches the package.json version via a unit test.
-export const arkUtilVersion = "0.56.0"
+export const arkUtilVersion = "0.56.1"
 
 export const initialRegistryContents = {
 	version: arkUtilVersion,