fix(tools): CLI 守卫防 argv[1] 空崩溃 + check-cocos 宿主版本缺失早退

- C1: 4 个 CLI 脚本守卫加 process.argv[1] 空值短路，避免动态 import 时 pathToFileURL(undefined) 崩溃
- I1: check-cocos-version CLI 在宿主 creator.version 为 null 时报错 exit 1，避免 CI 虚假 OK
- M1: scaffold 测试收紧 UUID 正则
- 新增 cli-entry 测试覆盖动态 import 场景

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

cocoscreator_projects/scripts/test/scaffold.test.mjs

@@ -42,7 +42,7 @@ test('setProjectIdentity 改 name 并生成新 uuid', () => {
     const pkg = setProjectIdentity(dest, 'doudizhu');
     assert.equal(pkg.name, 'doudizhu');
     assert.notEqual(pkg.uuid, 'seed-uuid');
-    assert.match(pkg.uuid, /^[0-9a-f-]{36}$/);
+    assert.match(pkg.uuid, /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/);
     const onDisk = JSON.parse(readFileSync(join(dest, 'package.json'), 'utf8'));
     assert.equal(onDisk.name, 'doudizhu');
     assert.equal(onDisk.creator.version, '3.8.8'); // 引擎版本保留