v0.4.0 - DHT for Decentralized Peer Discovery

What's New

This release adds Kademlia-style DHT for decentralized peer discovery, enabling nodes to find each other globally without centralized bootstrap servers.

DHT (Distributed Hash Table)

• Kademlia-style DHT for decentralized peer discovery
• 256-bit XOR distance metric for node routing
• K-buckets (K=8) with 256 buckets for routing table organization
• Iterative lookup with parallel queries (alpha=3)
• Bucket refresh and node liveness checking (ping/pong)
• All DHT messages fit 250-byte LoRa constraint
• DHT message types: PING, PONG, FIND_NODE, FIND_NODE_RESP, STORE, STORE_RESP
• Integration with discovery (local peers auto-populate DHT)
• CYXWIZ_DHT_SEEDS environment variable for bootstrapping

Daemon Integration

• DHT context creation and polling in main loop
• DHT message handling in message dispatcher
• /dht command to show DHT statistics
• DHT cleanup on shutdown

Changed

• Discovery module now supports optional DHT attachment via cyxwiz_discovery_set_dht()

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Full Changelog: v0.3.0...v0.4.0