fix(sdk): inject assertions into Creator-loaded contract harness

cocoscreator_projects/framework-tests/sdk/game-contract-harness.test.ts

@@ -1,6 +1,9 @@
 import assert from 'node:assert/strict';
 import { readFileSync } from 'node:fs';
 import { test } from 'node:test';
+import { runInNewContext } from 'node:vm';
+import ts from 'typescript';
+import * as gameSessionHost from '../../YouleNexus/assets/framework/sdk/runtime/game-session-host.ts';
 import type { RuntimeConfig } from '../../YouleNexus/assets/framework/config/runtime-config.ts';
 import type { OutboundEnvelope } from '../../YouleNexus/assets/framework/core/types/envelope.ts';
 import { createGameHostAdapter } from '../../YouleNexus/assets/framework/platform/game-host-adapter.ts';
@@ -21,6 +24,29 @@ const GAME_ROOMTYPE = JSON.parse(readFileSync(
   new URL('../fixtures/contracts/player-login-room.json', import.meta.url), 'utf8',
 )).data.roomtype as readonly unknown[];
 
+test('browser-like loader evaluates the emitted harness without Node builtin modules', () => {
+  const source = readFileSync(new URL(
+    '../../YouleNexus/assets/framework/sdk/testing/game-contract-harness.ts', import.meta.url,
+  ), 'utf8');
+  const { outputText } = ts.transpileModule(source, {
+    compilerOptions: { module: ts.ModuleKind.CommonJS, target: ts.ScriptTarget.ES2022 },
+  });
+  const exports: Record<string, unknown> = {};
+  const loaded: string[] = [];
+  assert.doesNotThrow(() => runInNewContext(outputText, {
+    exports,
+    require(specifier: string) {
+      if (specifier !== '../runtime/game-session-host.ts') {
+        throw new Error(`Creator cannot load runtime module: ${specifier}`);
+      }
+      loaded.push(specifier);
+      return gameSessionHost;
+    },
+  }));
+  assert.equal(typeof exports.assertGameContract, 'function');
+  assert.deepEqual(loaded, ['../runtime/game-session-host.ts']);
+});
+
 test('assertGameContract accepts a fixed-four game with its real nested roomtype and host fixture', () => {
   let invalidations = 0;
   let nextModuleId = 0;
@@ -40,6 +66,7 @@ test('assertGameContract accepts a fixed-four game with its real nested roomtype
       expectedSeatCount: 4,
       makeHost: makeConformanceHost(entry, () => { invalidations++; }, restoredDeskinfo),
     }],
+    assert,
   ));
   assert.equal(invalidations, 2);
   assert.equal(restoredDeskinfo.length, 0);