Improved code documentation in puma_utils.py with detailed docstrings and comments.

[github-actions]

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I have enhanced the code quality of the puma_utils.py file by adding detailed docstrings and comments to the list_bib function. These improvements provide a clear understanding of the function's purpose, parameters, return values, notes regarding environment variables, and information on potential exceptions. The rest of the code remains unchanged, focusing strictly on documentation enhancements.

• puma_utils.py Added docstrings and improved comments for better code clarity.

closes #3