Release v2.5.13

What's Changed

• chore: begin 2.5.13-SNAPSHOT by @github-actions[bot] in #764
• ci(release): sync reference docs to the homepage's develop branch by @bundolee in #765
• Fix Headings normalization in AutoTagging by @LonelyMidoriya in #766
• test: replace real-document fixtures with synthetic samples by @bundolee in #773
• fix(hybrid): require docling-parse 7.22.2 and name the cause in the 500 body by @hyunhee-jo in #772
• Update veraPDF version by @LonelyMidoriya in #770
• Update verapdf version by @MaximPlusov in #775
• ci: run the Central publish on Maven 3.9.16 by @hyunhee-jo in #777

Full Changelog: v2.5.12...v2.5.13