v1.9.0 release - new features

1.9.0 highlights
Added: Redis sharing/security signals, PHP OPcache health, production-readiness checks, and server-health (swap + cron freshness with never-run warning).
Changed: improved Redis session detection; collapsible sections restyled as consistent toggle bars.
Fixed: phpcs control-structure spacing in the OPcache advisory.

What's Changed

• Improve Redis session configuration checks and surface misconfigurations by @verzog in #31
• Add OPcache, production-readiness, swap/cron and Redis-sharing checks by @verzog in #32
• Style section dropdowns as proper toggle bars by @verzog in #33
• Make all toggle bars visually consistent by @verzog in #34
• Add CHANGELOG with 1.9.0 release notes by @verzog in #35

Full Changelog: v1.8.1...v1.9.0