Implement network manager simulator lifecycle (#53)

README.md

@@ -272,3 +272,13 @@ zerocode expansion, ACK state, and reliable windows have explicit limits;
 linked cancellation and final drop release every socket task. The executor,
 wire, backpressure, retry, and security contracts are documented in
 [`docs/udp-transport.md`](docs/udp-transport.md).
+The native network manager now layers ordered packet and CAPS callback
+registries, typed RAII subscriptions, synchronized simulator collections,
+cancellable connection events, ACK-gated circuit setup, current-simulator and
+seed-capability selection, CAPS `EnableSimulator`, UDP `DisableSimulator`, ping
+handling, typed region-handshake replies, two-interval keepalive detection, and
+deterministic disconnect reasons on that transport. Callback lists are
+snapshotted before invocation, and manager/transport workers retain no dropped
+client owner. The ownership,
+dispatch, lifecycle, and fake-server verification contracts are documented in
+[`docs/network-manager.md`](docs/network-manager.md).