mDNS (Multicast DNS) local peer discovery is now disabled by default in the libp2p helper. Previously mDNS was always active, causing nodes to broadcast on cloud provider internal networks and discover other VMs, which could trigger abuse reports. mDNS can be re-enabled for local development and testing by setting the environment variable `LIBP2P_ENABLE_MDNS=true`; integration tests have been updated to set this variable so that local multi-node test setups continue to work without changes.
