fix(sdk): enforce runtime dependency boundary

cocoscreator_projects/YouleNexus/assets/framework/sdk/runtime/game-session-host.ts

@@ -5,9 +5,8 @@ import type {
   GameServerMessage,
   PlatformToGameEvent,
 } from '../contracts/index.ts';
-import { Route } from '../../core/constants.ts';
 
-const RESERVED_ROUTES = new Set<string>(Object.values(Route));
+const RESERVED_GAME_ENTRY_ROUTES = new Set(['platform', 'agent', 'room']);
 const GAME_SESSION_OPEN_FAULT_BRAND = Symbol.for(
   'youle.framework.sdk.GameSessionOpenFault',
 );
@@ -104,7 +103,7 @@ export function assertGameEntry(entry: GameEntry): void {
 /** The single GameEntry route admission check shared by runtime adapters. */
 export function assertGameRoute(route: unknown): asserts route is string {
   assertNonEmptyText(route, 'route');
-  if (RESERVED_ROUTES.has(route)) {
+  if (RESERVED_GAME_ENTRY_ROUTES.has(route)) {
     throw new Error(`GameEntry reserved route: ${route}`);
   }
 }