test: deterministic two-node S2S convergence simulator — real handshake + join/part/rejoin/FJOIN-TS-arbitration driven through actual code paths, proptest-randomised churn asserts both sides always converge; extract Server::part so the sim and the PART command share one path

src/lib.rs

@@ -35,6 +35,8 @@ pub mod server;
 pub mod socketengine;
 pub mod tls;
 pub mod tls_rustls;
+#[cfg(test)]
+mod s2s_sim;
 pub mod users;
 pub mod watch;
 pub mod websocket;