synthetic-divi-filters.html now stores its paragraph as Divi does (unicode
escapes, bytes built with chr(92) and checked with od). A data-provider test
inserts a section as a user without unfiltered_html into every Divi 5 fixture
page read from disk and asserts that every other byte stays.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
