Multi-Signature Wallet Security

Review the security of this multi-signature wallet:

```
${{CONTRACT_CODE}}
```

Signer Configuration: ${{SIGNER_CONFIG}}
Threshold: ${{THRESHOLD}}

Security review:
1. Signature verification mechanism
2. Vulnerabilities check:
   - Signature replay
   - Nonce handling
   - Signature malleability
   - Signer management
3. Threshold enforcement
4. Transaction execution security
5. Gas handling for signers
6. Key management recommendations
7. Recovery mechanisms
8. Integration with hardware wallets
9. Comparison with Gnosis Safe
10. Recommended improvements

Include operational security guidelines.