The key came from the shared game random engine, which is seeded from
the start time. It now comes from std::random_device through a small
helper. The key stays a 32 bit number, so the packets do not change.
The master and world servers no longer write the key or its hash to
the log.
Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>
