- Updated External Service Wrappers section with new CEA pages
- Added comprehensive Security & Performance Optimizations section
- Documented smart CSP system and external iframe support
- Added security middleware, input validation, and caching documentation
- Updated system status with latest security improvements
- Documented emergency rollback system and Railway deployment fixes
- Added future-proof external service integration guide
- Updated last modified date to 2025-08-16
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Co-Authored-By: Claude <noreply@anthropic.com>
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