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Robustness pass over MrGameEng.Net: - WebSocketServer heartbeats each connection (configurable interval/timeout) and drops peers idle past the timeout — detects half-open TCP that vanished without a close frame. Tracks last-activity per connection. - Reassembled messages capped (server and client) so a peer cannot exhaust memory with an oversized fragmented message. - Replication snapshots carry a protocol-version byte; a client receiving a mismatched version drops the message instead of decoding garbage, and a truncated snapshot is ignored without throwing. - ReplicationClient.Clear() deletes all replicated entities, so clients can wipe stale state before reconnecting. Tests: heartbeat healthy-survives / silent-peer-dropped, protocol-version mismatch, truncated snapshot, replication clear. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>