Block a user
Story: ListDataSource for Pre-fetched Content
Story: EffectPlugin ABC and Registry
Epic: Additional Display Backends & Pipeline Tools
feat: add glyph caching to PygameDisplay for performance
Refactor: Move effects_plugins to engine/effects/plugins
feat(ui): enhance UI panel with preset picker and parameter adjustment
feat(pipeline): add fixtures system for cached test data
feat(pipeline): add direct CLI mode with validation framework
feat(effects): add entropy parameter to effect plugins