chore: bump v2.5.9 and update README for recent features (#398)

* fix: sort tariff datapoints newest-first in trade policy panel

* fix: update tests broken by cachedFetchJson migration

- Restore "Strip unterminated" comment in summarize-article.ts that
  tests use to locate the unterminated tag stripping section
- Update ACLED tests to check for cachedFetchJson instead of removed
  getCachedJson/setCachedJson patterns

* chore: bump version to 2.5.9 and make pre-push hook executable

* docs: update README with supply chain intel, universal CII, Happy Monitor, security hardening, and recent features

Author: koala73