feat(worker): BandelTicketClient fuer die Ticketsystem-REST-API

tests/ClaudeDo.Worker.Tests/Tickets/StubHandler.cs

@@ -0,0 +1,25 @@
+using System.Net;
+using System.Text;
+
+namespace ClaudeDo.Worker.Tests.Tickets;
+
+/// <summary>
+/// Fakes the HTTP transport for BandelTicketClient tests. No test using this may touch the
+/// network — reused by later tasks that also exercise the ticket client.
+/// </summary>
+internal sealed class StubHandler : HttpMessageHandler
+{
+    public readonly List<HttpRequestMessage> Requests = new();
+    public readonly List<string> Bodies = new();
+    private readonly Func<HttpRequestMessage, (HttpStatusCode, string)> _respond;
+
+    public StubHandler(Func<HttpRequestMessage, (HttpStatusCode, string)> respond) => _respond = respond;
+
+    protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken ct)
+    {
+        Requests.Add(request);
+        Bodies.Add(request.Content is null ? "" : await request.Content.ReadAsStringAsync(ct));
+        var (code, body) = _respond(request);
+        return new HttpResponseMessage(code) { Content = new StringContent(body, Encoding.UTF8, "application/json") };
+    }
+}