fix(tui): surface incomplete statistics and strengthen review coverage

crates/irtt-server/tests/protocol_contracts.rs

@@ -355,3 +355,12 @@ fn duration_close_waits_for_rate_allowance_after_the_deadline() {
     assert_eq!(closed.recv_window, Some(3));
     assert_eq!(server.session_count(), 0);
 }
+
+#[test]
+fn default_server_resource_limits_remain_bounded() {
+    let config = ServerConfig::default();
+    // Upper resource budgets, not an exact default or a comparison against
+    // the same constants used by the implementation. Smaller bounds are fine.
+    assert!((1..=1024).contains(&config.max_sessions()));
+    assert!((1..=65_507).contains(&config.max_packet_length()));
+}