Respond to code review request

[Copilot]

Performed comprehensive code review of pepper support implementation as requested by @Absy00.

Review findings

• ✅ Schema correctly extends with optional pepper: BinaryLike
• ✅ Pepper properly threaded through createArgon2KeyGenerator and passed as secret to Node.js argon2 API
• ✅ Verification logic correctly uses configured pepper
• ✅ Test coverage validates correct/mismatched pepper scenarios and Buffer support
• ✅ Linter and type checking pass
• ✅ No security vulnerabilities introduced

Recommendation

Implementation follows Argon2 spec correctly. Minor suggestion: add JSDoc to the pepper option explaining its purpose and security requirements (must be stored securely and consistently, unlike salts).

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.