Internal audit and review of smart contracts

**What**

Conduct an internal audit of the smart contracts (Asset, AssetRegistry, GameToken, and related interfaces) for security, correctness, and best practices, as well as a general review for optimizations and improvements.

**Why**

An internal audit helps identify vulnerabilities, logic errors, and areas for improvement before external review or mainnet deployment. A broader review for optimizations and improvements can reduce gas costs, enhance maintainability, and refine the design. Together they reduce risk and build confidence in the codebase.

**How**

- Review all smart contracts for security issues (reentrancy, access control, integer overflow, etc.)
- Verify business logic correctness (subscription flows, fee splitting, permit handling)
- Check adherence to Solidity best practices and coding standards
- Identify optimization opportunities (gas, storage, logic)
- Suggest improvements (architecture, readability, error handling, events)
- Document findings in a report with severity and recommendations
- Prioritize and track remediation of identified issues

**Acceptance Criteria**

- All smart contracts have been reviewed
- Security assessment is documented
- Logic and correctness have been verified
- Optimization and improvement suggestions are documented
- Findings report is produced with severity levels
- Critical and high findings have remediation recommendations

**Estimation**

**Dependencies**

Depends on implemented smart contracts (e.g. Asset, AssetRegistry, fee split changes)