"""Shared utility helpers used across caketool modules.

Sub-modules:

- ``arr_utils`` – NumPy array helpers (percentile bin generation).
- ``bq_utils`` – Google BigQuery helpers (cost-guarded query execution).
- ``lib_utils`` – Dynamic import utilities and dependency-checking decorators.
- ``num_utils`` – Smart numeric rounding.
- ``phone_utils`` – Vietnamese phone number normalisation.
- ``str_utils`` – Vietnamese diacritic removal and string helpers.
"""
