Release v20.62.1

Fixed

• Fixed a process crash in observable-query streaming (SSE and WebSocket) when a client disconnects while an emission is in flight. The emission callback is async void and, once the connection's write lock, emission gate and cancellation source are disposed on disconnect, the in-flight emission threw ObjectDisposedException on a background thread, which went unhandled and terminated the whole process. Disconnecting mid-emission is now a graceful no-op: the expected cancellation/disposal/transport signals are swallowed and only genuine failures are surfaced to the subscriber.