wrap yaml into main to avoid it auto-running on validate through the import

[CIGbalance]

This pull request refactors the yaml_to_html.py script to improve code structure, readability, and maintainability. The main changes involve moving data loading and processing into a __main__ guard, reformatting code for clarity, and making minor improvements to table generation.

Code organization and structure:

• Moved the main script logic (data loading, column selection, and table generation) under the if __name__ == "__main__": block to prevent accidental execution when the module is imported.
• Reformatted code for better readability, including consistent indentation and line breaks, especially in the linkify_cell function and table generation. [1] [2]

Data loading and processing:

• Relocated the data loading and column selection logic into the main guard, making the script's execution flow clearer and more modular. [1] [2]

[Copilot]

Pull request overview

This PR prevents yaml_to_html.py from executing its YAML→HTML generation logic on import (e.g., when utils/validate_yaml.py imports default_columns), by moving runtime behavior behind a __main__ guard.

Changes:

• Wrapped YAML loading, table generation, and HTML file writing in if __name__ == "__main__":.
• Moved default_columns to module scope so it remains importable without triggering generation.
• Minor formatting adjustments (e.g., multiline href assignment, to_html call formatting).

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