feat: listInvocations() for the detached-runs monitor

Returns every tracked detached invocation (newest-first) with id,
phase, current step, timestamps, error, flow name and project.
Regenerated stubs from the platform hub.proto.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/src/hub_client.dart

@@ -92,6 +92,7 @@ typedef SubmitResponse = pb.SubmitResponse;
 // generated package directly.
 typedef SubmitStreamEvent = pb.SubmitStreamEvent;
 typedef InvocationStatus = pb.InvocationStatus;
+typedef InvocationEntry = pb.InvocationEntry;
 
 /// Typed client for the F∆I Hub gRPC surface. Construct once,
 /// reuse for the process lifetime, call [close] on shutdown.
@@ -871,6 +872,14 @@ class HubClient {
     return r.cancelled;
   }
 
+  /// Every tracked detached invocation (newest-first) for a monitor
+  /// surface — Studio's detached-runs list. Empty when detached
+  /// invocations are disabled or none have run this process.
+  Future<List<InvocationEntry>> listInvocations() async {
+    final r = await _hub.listInvocations(Empty());
+    return r.invocations;
+  }
+
   pb.SubmitRequest _buildSubmitRequest({
     required String flowYaml,
     required Map<String, String> textInputs,