Initial implementation of tesseras-url Decentralized URL shortener built on tesseras-dht. Includes: - tud daemon: DHT node, Unix socket API, HTTP 302 redirect server - tu CLI: shorten, resolve, del, list, status commands - Auto-generated slugs (8-byte SHA256, base58) or custom slugs - TTL support (default: forever) - Automatic re-join of bootstrap nodes when routing table is empty - OpenBSD pledge(2) and unveil(2) sandboxing - DNS SRV bootstrap discovery - Verbose mode (-v) for both binaries