message: network-core: Doc note about server statelessness
  Document the behavioral assumption of server::Node being a
  stateless conduit for individual requests, as it is for network-grpc.
diff: @@ -9,6 +9,11 @@ pub mod gossip;
  /// An implementation of a blockchain node implements this trait to
  /// serve the network protocols using node's subsystems such as
  /// block storage and transaction engine.
  +///
  +/// A `Node` implementation is expected to be stateless, that is,
  +/// there is no particular association between client peers and instances
  +/// of the implementing type, and conversely, multiple instances can be
  +/// created to serve different requests from a single client.
  pub trait Node {
  /// The implementation of the block service.
  type BlockService: block::BlockService;
  