feat(event-subscriber): project a status-set as INGESCHREVEN via hoofdObject (refs #75)

Bind the NRC hoofdObject, recognise a zaken/status/create notification, and key the
projection on the zaak (hoofdObject) so the status updates the existing INGEDIEND row
to INGESCHREVEN — without reading OpenZaak (§8.1). Retain the ZGW resource in the log
(new column + migration) so a rebuild reproduces the approved status. Updates the
acceptance fakes for the new IAclClient/IZaakGateway members.

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

tests/acceptance/Support/InMemoryZaakGateway.cs

@@ -11,10 +11,17 @@ public sealed class InMemoryZaakGateway : IZaakGateway
     public static readonly Uri CreatedZaakUrl = new("http://openzaak/zaken/api/v1/zaken/created-123");
 
     public ZaakRequest? Captured { get; private set; }
+    public (Uri Zaak, Uri Zaaktype, DateOnly Datum)? Approved { get; private set; }
 
     public Task<Uri> OpenZaakAsync(ZaakRequest request, CancellationToken ct = default)
     {
         Captured = request;
         return Task.FromResult(CreatedZaakUrl);
     }
+
+    public Task SetZaakToEindstatusAsync(Uri zaakUrl, Uri zaaktypeUrl, DateOnly datumStatusGezet, CancellationToken ct = default)
+    {
+        Approved = (zaakUrl, zaaktypeUrl, datumStatusGezet);
+        return Task.CompletedTask;
+    }
 }