fix(core): update

ts/classes.envelope.ts

@@ -0,0 +1,13 @@
+import type { SmartSign } from './classes.smartsign.js';
+import * as plugins from './smartsign.plugins.js';
+
+export class SigningEnvelope {
+  public pdf: plugins.smartpdf.IPdf;
+  constructor(smartsignRef: SmartSign, originalPdf: plugins.smartpdf.IPdf) {
+    this.pdf = originalPdf;
+  }
+
+  exportSignedPdf() {
+
+  }
+}