feat: add verifyAndExecute function to IdentityManagerV2

[malgus01]

Pull Request

Summary

This PR introduces the verifyAndExecute external function in IdentityManagerV2, enabling user verification via World ID proofs with proper validation, expiration handling, and event emission.

Changes

• Added
  • /// VERIFICATION FUNCTIONS section header for clarity.
  • verifyAndExecute external function:
    • Validates nullifiers, prevents duplicate verification, and checks expiration.
    • Calls worldId.verifyProof to ensure proof authenticity.
    • Records nullifier usage.
    • Determines verification level (ORB vs. DEVICE) based on groupId.
    • Stores verification data via _storeVerification.
    • Emits UserVerified event.
• Modified
  • Refactored constructor formatting for readability.
• Formatting
  • Applied forge fmt for consistent style.

Motivation

• Provides a secure, external entry point for verifying users against World ID.
• Ensures strong protection against:
  • Duplicate verifications (nullifier reuse).
  • Invalid or expired verification attempts.
• Establishes event-based transparency for off-chain indexing.

Next Steps

• Add unit tests for verifyAndExecute covering:
  • Successful verification (ORB and DEVICE).
  • Duplicate nullifier rejection.
  • Expired timestamp reverts.
  • Already verified user reverts.
• Integrate with frontend flows for onboarding verified users.