What changed

• rename the date sort to Newest → oldest
• add a complementary Oldest → newest option
• preserve both choices in shareable URL state
• cache-bust the updated browser script and add regression assertions

User impact

The date direction is now unambiguous, and visitors can browse in either chronological direction.

Validation

• node --check site/script.js
• node scripts/check.mjs
• npm --prefix worker run check
• JSON validation for Site Data and SEO benchmark files
• git diff --check
• browser verification of both date directions and URL state