fix(build): modernize package exports, tooling configuration, and test setup

test/test.node+chromium.ts

@@ -1,4 +1,4 @@
-import { expect, tap } from '@push.rocks/tapbundle';
+import { expect, tap } from '@git.zone/tstest/tapbundle';
 
 import * as smartyaml from '../ts/index.js';
 
@@ -25,4 +25,4 @@ tap.test('should allow dots in key', async () => {
   expect(testObject['myKey.with.dots']).toEqual('some');
 });
 
-tap.start();
+export default tap.start();