feat(worker): remove a queued interactive message

StreamingClaudeSession.RemoveQueuedAsync drops the first occurrence of a queued
message from _pending and re-broadcasts the updated queue. Wired through
InteractiveSessionService + WorkerHub.RemoveQueuedInteractiveMessage +
IWorkerClient.RemoveQueuedInteractiveMessageAsync. Removal by text (first match)
is robust to a turn flushing mid-click. Fakes + ILiveSession impls updated.

src/ClaudeDo.Worker/Runner/Interfaces/ILiveSession.cs

@@ -4,6 +4,7 @@ public interface ILiveSession : IAsyncDisposable
 {
     bool IsTurnInFlight { get; }
     Task SendUserMessageAsync(string text, CancellationToken ct);
+    Task RemoveQueuedAsync(string text, CancellationToken ct);
     Task InterruptAsync(CancellationToken ct);
     Task StopAsync();
 }