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ab52df470a
A leading UTF-8 byte order mark (U+FEFF) before the first `#` stops the Markdown parser from recognizing the heading, so the guide renders its title as a paragraph and drops the standard docs header. The character is invisible, so it cannot be caught in review. Add a check in the guides generation pipeline that throws when a source file starts with a BOM, failing the build with the offending file name. This sits alongside the existing unknown-anchor check and prevents the regression fixed in #69889 from recurring.