[Examples] Create example Genesis files

[copyleftdev]

Task

Create example Genesis files demonstrating different use cases.

Examples

1. simple-economy.yaml - accounts, transactions, balances
2. user-behavior.yaml - users, sessions, events
3. game-world.yaml - players, items, trades
4. sensor-network.yaml - devices, readings, alerts

Acceptance Criteria

• Each example is valid and generates data
• Examples demonstrate different features
• Annotated with comments explaining features
• Located in genesis/ directory