- Add Composer/Node/Playwright caching to all CI jobs (fixes #416)
- Harmonize PHP to >=8.4 across all 40 packages + root (fixes #424)
- Expand drift-detector.sh to cover all subsystems (fixes #425)
- Remove graphql from full metapackage (fixes #337)
- #405 already resolved (setCurrentLanguage on interface)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>