Implement Wallet Balance Tracking and Updates

[mesikewisdom19-source]

Build balance management and tracking functionality for agent wallets.

Requirements

• Implement balance calculation logic
• Create balance update mechanisms
• Add balance retrieval endpoints
• Implement atomic balance transactions
• Add balance history tracking
• Prevent negative balance (if required by business rules)

Acceptance Criteria

• Balance tracking is accurate and consistent
• Balance updates are atomic and thread-safe
• Balance retrieval endpoints return correct data
• Historical balance records are maintained
• Unit tests cover all balance operations