A machine is titled by its own hostname, and follows a rename

The name a machine was added under stays its identity — the URL, its accent, what the hub's
API calls it — and is what the Machines page shows as 'Added as'. The hostname is read live
rather than at start-up, so renaming a machine reaches the console without a restart.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

internal/api/stacks.go

@@ -363,7 +363,7 @@ func (s *Server) hubStacks(ctx context.Context, node string) ([]stack, error) {
 			st.Note = note
 			continue
 		}
-		st.Remote, st.HeldBy = remote, s.host
+		st.Remote, st.HeldBy = remote, s.hostName()
 	}
 	var held []stack
 	for _, st := range res.Stacks {