Show accepted signup delivery without a second send step (#62)

frontend/packages/sxchnge_auth/lib/src/services/instrumented.dart

@@ -111,13 +111,27 @@ class InstrumentedAuthServices
     simulation: _simulation(loginService),
   );
   @override
-  Future<AuthResult> signup(SignupRequest request) => _run(
-    JourneyKind.signup,
-    JourneyStep.signup,
-    () => signupService.signup(request),
-    (r) => r.isSimulated,
-    simulation: _simulation(signupService),
-  );
+  Future<AuthResult> signup(SignupRequest request) async {
+    final result = await _run(
+      JourneyKind.signup,
+      JourneyStep.signup,
+      () => signupService.signup(request),
+      (r) => r.isSimulated,
+      simulation: _simulation(signupService),
+    );
+    final delivery = result.delivery;
+    if (delivery != null) {
+      final operation = recorder.begin(
+        JourneyKind.verification,
+        JourneyStep.emailDelivery,
+        onboarding: true,
+        simulated: delivery.isSimulated,
+      );
+      recorder.finish(operation, simulated: delivery.isSimulated);
+    }
+    return result;
+  }
+
   @override
   Future<VerificationResult> send({
     required String email,