hc user delete: ask first, and take -y

It deleted the user and their tokens at once, while every other delete
asks and takes -y/--yes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

cmd/hc/admin.go

@@ -349,9 +349,13 @@ operator, log) or grants such as --grant config:read --grant sets:write:guests.
 	f.BoolVar(&enable, "enable", false, "enable the user again")
 	f.StringVar(&comment, "comment", "", "a comment")
 	cmd.AddCommand(update)
-	cmd.AddCommand(&cobra.Command{
+	var yes bool
+	del := &cobra.Command{
 		Use: "delete USER", Short: "Delete a user and their tokens", Args: cobra.ExactArgs(1),
 		RunE: func(cmd *cobra.Command, args []string) error {
+			if !confirm(fmt.Sprintf("Delete user %s and their tokens?", args[0]), yes) {
+				return fmt.Errorf("not deleted")
+			}
 			id, err := userID(args[0])
 			if err != nil {
 				return err
@@ -365,7 +369,9 @@ operator, log) or grants such as --grant config:read --grant sets:write:guests.
 			}
 			return nil
 		},
-	})
+	}
+	del.Flags().BoolVarP(&yes, "yes", "y", false, "don't ask")
+	cmd.AddCommand(del)
 	return cmd
 }