Approved.

This is an implicit dependency of INIT-011.

You may create:

- app/helpers/escape_html.php

and register it inside Bootstrap::loadHelpers().

Requirements:

- Implement ONLY escape_html().
- Wrapper around htmlspecialchars().
- UTF-8.
- ENT_QUOTES.
- Return string.
- No additional helper functions.
- No helper library.
- No utility class.

This helper is considered an implementation prerequisite for the documented INIT-011 output escaping rule, not a new feature.

Do not create any other undocumented files.

Continue INIT-011 afterwards.