# GSD Review Request - Phase 1.1 Tasks 4-6

## Context
x0x project - Phase 1.1 (Agent Identity & Key Management)

## Tasks Completed
- Task 4: Implement Keypair Management (MachineKeypair, AgentKeypair)
- Task 5: Implement PeerId Verification (verify() methods)
- Task 6: Define Identity Struct (Identity combining both keypairs)

## Files Modified
- src/identity.rs (extended with keypair types, verify methods, Identity struct)

## Key Implementation Details
- MachineKeypair::generate() using ant-quic's generate_ml_dsa_keypair()
- AgentKeypair::generate() using ant-quic's generate_ml_dsa_keypair()
- Both have to_bytes() and from_bytes() for serialization
- MachineId::verify() and AgentId::verify() for key substitution detection
- Identity struct combining both keypairs with generate() method
- Display impls for both ID types (hex fingerprint output)
- Comprehensive test coverage (21 tests in identity.rs)

## Build Status
- cargo check: PASS
- cargo clippy: PASS
- cargo nextest run: PASS (32/32 tests)

## Review Focus
1. Code correctness and completeness
2. Security considerations (zeroize, key exposure)
3. API design and ergonomics
4. Test coverage
5. Documentation quality
6. Zero Tolerance Policy compliance

Please review tasks 4-6 for Phase 1.1 of the x0x project.
