Fragility: Dependency on exact PyArrow error message format in CSVHandler

[debanshd]

The CSVHandler in src/croissant_maker/handlers/csv_handler.py uses a regular expression _ARROW_COL_RE to parse column indices from PyArrow parsing errors:

_ARROW_COL_RE = re.compile(r"In CSV column #(\d+): CSV conversion error to (\w+)")

This regex is highly dependent on the specific error message format of PyArrow. If PyArrow updates its error messages, this regex will fail to match, potentially leading to silent failures or incorrect error reporting to the user. It would be more robust to use structured error information if available from PyArrow or provide a fallback mechanism.