add_common_io_args
=============================================

.. py:function:: petpal.cli.cli_tac_fitting.add_common_io_args(parser: argparse.ArgumentParser) -> argparse._ArgumentGroup

   Adds common input/output arguments to the provided argument parser.

   This helper function configures arguments that are shared between all subcommands
   for specifying input TAC paths, ROI TAC paths, output directory and output filename prefix.

   :param parser: Argument parser (or subparser) to which the
                  common I/O arguments will be added.
   :type parser: argparse.ArgumentParser

   :returns: *argparse._ArgumentGroup* -- The argument group containing the I/O arguments.