[OpenAI Codex] [ Crypto ] Fix CrossChainBridge replay protection

[justusaugust]

/claim #920

Summary

• Replace the packed-message signature check with EIP-712 typed transfer hashes bound to chain ID and verifying contract.
• Add inbound per-recipient nonces, outbound per-sender nonces, zero-address signature recovery handling, and low-s validation.
• Add a Solidity test harness that compiles the bridge, deploys it on Ganache, verifies the EIP-712 digest against ethers, blocks same-chain replay, blocks contract-address replay, rejects invalid signatures, and checks nonce increments.

Verification

• npm install --no-package-lock
• npm test

Demo Video

• Short demo video for this PR

[github-actions]

Unfortunately the changes in this PR didn't fully resolve the issue. Please rework your solution and submit a new pull request.

Make sure to review the acceptance criteria in the linked issue and verify all conditions are met before resubmitting. See CONTRIBUTING.md for guidelines.