- Add complete Monopoly implementation with pure state engine (MonopolyLogic.js),
static data (MonopolyData.js), AI (MonopolyAI.js), and Phaser scene (MonopolyGame.js)
- Implement full game rules: property buying, auctions, building houses/hotels,
mortgages, jail, chance/community chest cards, rent calculation, bankruptcy
- Add 5-level AI with configurable greed, blunder rate, and thinking delay
- Add spritesheet loading for monopoly pawns and cards with graceful fallbacks
- Register game in registry, main.js, and game room scene dispatcher
- Add spritesheet creation guide (sprites.md) and update game-icons.png
