Phase 9: Content Management
- Standard stack: Scrimage for images, ZIO S3 for storage, CodeMirror 6 for editor
- CMS page patterns from WinterCMS with Pebble templates
- Media library with storage abstraction (local/S3)
- Content revision history with document versioning pattern
- Navigation menu system with polymorphic item types
- Hot reload via WatchService + Pebble cache invalidation
