Update documentation to emphasize core modules reusability:
- ARCHITECTURE.md: New file explaining game-agnostic principles
- CLAUDE.md: Add strict rules for core modules, pub/sub patterns
- README.md: Update roadmap with Phase 1-4, clarify status
Core modules (ResourceModule, StorageModule, etc.) will be
reusable between Mobile Command and WarFactory via pub/sub.
Game-specific logic stays in GameModule via event subscriptions.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
