📁 Medium Priority: Split large p2p_enhanced.rs file into modules

[quantumshiro]

Problem

The file src/network/p2p_enhanced.rs is 2,356 lines - extremely large and difficult to maintain. It handles multiple responsibilities that should be separated.

Current Issues

• 🔍 Hard to navigate and understand
• 🧪 Difficult to test individual components
• 👥 Multiple developers can't work on it simultaneously
• 🔄 High risk of merge conflicts
• 📚 Violates single responsibility principle

Proposed Module Structure

src/network/
├── p2p_enhanced/
│   ├── mod.rs                 // Public interface and re-exports
│   ├── connection_manager.rs  // Connection handling and lifecycle
│   ├── message_handler.rs     // Message processing and routing
│   ├── peer_discovery.rs      // Peer discovery and management
│   ├── network_topology.rs    // Network analysis and health
│   └── rate_limiter.rs        // Rate limiting and QoS
└── p2p_enhanced.rs           // Deprecated - remove after migration

Migration Plan

Phase 1: Extract Connection Management

• Create connection_manager.rs with connection logic
• Move connection-related structs and methods
• Update imports and tests

Phase 2: Extract Message Handling

• Create message_handler.rs with message processing
• Move message routing and priority queue logic
• Maintain message processing performance

Phase 3: Extract Peer Discovery

• Create peer_discovery.rs with peer management
• Move peer tracking and discovery logic
• Preserve network topology features

Phase 4: Finalize Migration

• Create mod.rs with clean public interface
• Update all imports throughout codebase
• Remove original large file
• Verify all tests pass

Definition of Done

• Each module is <500 lines
• Clear separation of concerns
• All existing functionality preserved
• Test coverage maintained
• Documentation updated
• No performance regression

Priority: 📊 Medium

Important for long-term maintainability but not blocking critical features.

Estimated Effort: 5-6 days