Features

• 1120b9b feat: Add loadESLint() API method for v8 (#18098) (Nicholas C. Zakas)
• dca7d0f feat: Enable eslint.config.mjs and eslint.config.cjs (#18066) (Nitin Kumar)

Bug Fixes

• 2196d97 fix: handle absolute file paths in FlatRuleTester (#18064) (Nitin Kumar)
• 69dd1d1 fix: Ensure config keys are printed for config errors (#18067) (Nitin Kumar)
• 9852a31 fix: deep merge behavior in flat config (#18065) (Nitin Kumar)
• 4c7e9b0 fix: allow circular references in config (#18056) (Milos Djermanovic)

Documentation

• 84922d0 docs: Show prerelease version in dropdown (#18139) (Nicholas C. Zakas)
• 5b8c363 docs: Switch to Ethical Ads (#18117) (Milos Djermanovic)
• 77dbfd9 docs: show NEXT in version selectors (#18052) (Milos Djermanovic)

Chores

• 1813aec chore: upgrade @eslint/js@8.57.0 (#18143) (Milos Djermanovic)
• 5c356bb chore: package.json update for @eslint/js release (Jenkins)
• f4a1fe2 test: add more tests for ignoring files and directories (#18068) (Nitin Kumar)
• 42c0aef ci: Enable CI for v8.x branch (#18047) (Milos Djermanovic)