test(acceptance): beoordeling scenario asserts the workflow task is completed (refs #13)

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

tests/acceptance/Features/EenRegistratieBeoordelen.feature

@@ -15,6 +15,7 @@ Feature: Een registratie beoordelen
     When the behandelaar decides "goedkeuren"
     Then the registration has status "INGESCHREVEN"
     And the zaak's final status is set via the ACL
+    And the beoordeling task is completed with "goedkeuren"
 
   Scenario: Afwijzen wijst de registratie af zonder de ACL
     Given a submitted registration with an opened zaak
@@ -22,3 +23,4 @@ Feature: Een registratie beoordelen
     And the behandelaar decides "afwijzen"
     Then the registration has status "AFGEWEZEN"
     And the ACL is not asked to set the zaak status
+    And the beoordeling task is completed with "afwijzen"