test(infra): verify-objecten asserts Objecten API up + token auth + trusts Objecttypen (refs #140)

Fails against the current stack (no objecten service yet) with a clear
"no running objecten container" message. Green comes with the compose
service + seeded setup_configuration in the next commit.

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

.gitea/workflows/ci.yaml

@@ -204,6 +204,9 @@ jobs:
       - name: Objecttypen API up + token authenticates
         id: objecttypen
         run: OBJECTTYPEN_TIMEOUT=120 make verify-objecttypen
+      - name: Objecten API up + token authenticates + trusts Objecttypen
+        id: objecten
+        run: OBJECTEN_TIMEOUT=120 make verify-objecten
       - name: ACL ↔ OpenZaak integration tests
         id: acl
         run: make verify-acl
@@ -237,6 +240,7 @@ jobs:
           UP: ${{ steps.up.outcome }}
           OBS: ${{ steps.obs.outcome }}
           OBJECTTYPEN: ${{ steps.objecttypen.outcome }}
+          OBJECTEN: ${{ steps.objecten.outcome }}
           ACL: ${{ steps.acl.outcome }}
           NRC: ${{ steps.nrc.outcome }}
           PROJECTION: ${{ steps.projection.outcome }}
@@ -256,6 +260,7 @@ jobs:
             echo "| Bring up + health | $(icon "$UP") |"
             echo "| Observability backplane | $(icon "$OBS") |"
             echo "| Objecttypen API + token | $(icon "$OBJECTTYPEN") |"
+            echo "| Objecten API + token | $(icon "$OBJECTEN") |"
             echo "| ACL ↔ OpenZaak | $(icon "$ACL") |"
             echo "| OpenZaak → NRC | $(icon "$NRC") |"
             echo "| NRC → Event Subscriber → projection | $(icon "$PROJECTION") |"