fix(config): update .smartconfig.json handling and harden bundler runtime compatibility

test/ts_web/fixture-lit.ts

@@ -11,10 +11,10 @@ export class MyElement extends LitElement {
   `;
 
   @property({ type: String })
-  name = 'World';
+  accessor name = 'World';
 
   @property({ type: Number })
-  count = 0;
+  accessor count = 0;
 
   render() {
     return html`