test(acceptance): beoordeling escalation — both branches (S-14, refs #15)

Gherkin scenarios for the two branches: a beoordeling left unclaimed for 14 days
escalates to the teamlead, and one completed before the timer fires does not.
Driven through the escalation worker against an in-memory Flowable stand-in.

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

tests/acceptance/Features/EenBeoordelingEscaleren.feature

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+# language: en
+# Drives S-14 (#15). A beoordeling a behandelaar does not pick up within 14 days escalates to the
+# teamlead: a non-interrupting boundary timer parks a BeoordelingEscaleren job (ADR-0015) which the
+# escalation worker drains, reassigning the still-open Beoordelen task's candidate group to teamlead.
+# A beoordeling completed before the timer fires does not escalate. This scenario exercises the
+# escalation worker against an in-memory Flowable stand-in; the timer firing live is verify-domain.
+Feature: Een beoordeling escaleren
+  Als teamleider wil ik dat een beoordeling die na 14 dagen niet is opgepakt naar mij escaleert
+  zodat aanvragen niet blijven liggen.
+
+  Scenario: Na 14 dagen zonder oppakken escaleert de beoordeling naar de teamlead
+    Given a registration parked at the Beoordelen task for the behandelaar
+    When the 14-day escalation timer fires
+    And the escalation worker runs
+    Then the beoordeling is reassigned to the teamlead
+
+  Scenario: Een tijdig afgeronde beoordeling escaleert niet
+    Given a registration parked at the Beoordelen task for the behandelaar
+    When the behandelaar completes the beoordeling before the timer fires
+    And the 14-day escalation timer fires
+    And the escalation worker runs
+    Then the beoordeling stays with the behandelaar