- Add rate limiter to TCP and HTTP servers
- Share single LSMTree between TCP and HTTP servers
- Replace unsafe cast[string]/cast[seq[byte]] with safe helpers
- Stabilize gossip UDP socket with exponential backoff
- Fix TCP_NODELAY via low-level setSockOptInt(IPPROTO_TCP)
(asyncnet.setSockOpt(OptNoDelay) uses SOL_SOCKET and fails)
- Apply TCP_NODELAY to server and websocket sockets