- Expand README.md with complete feature list (quests, vendors, combat, spells, inventory, etc.)
- Update Controls section with comprehensive keybindings organized by category
- Rewrite docs/quickstart.md from "TODO" state to reflect all working features
- Enhance docs/architecture.md with detailed system descriptions and current capabilities
- Add CHANGELOG.md documenting 50+ recent commits grouped by feature area
- Add FEATURES.md with 100+ documented features across 8 major categories
- Update technical details with architecture, networking, and asset loading info