Adds an optional passive UDP transport (TRANSPORT=udp) that reads the node's
"Mesh via UDP" LAN multicast instead of holding the radio's single API/serial
slot, filters to the PRIMARY channel by channel-hash (fail-closed), decrypts
with the default PSK, and enriches payloads to match the API-path packet shape
so the collector receives identical records. Implemented as a MeshProtocol
provider; 100% unit coverage on new modules; real-capture fixtures included
(node IDs/GPS anonymized). See PR description for details.
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>