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- PeerSyncWorker reads DADNS_PEER_SYNC_PEER_URL / _USERNAME / _PASSWORD env vars to populate a single peer without a config file; deduped against any config-file peers so the URL never appears twice - 2 new tests (119 total, all passing) - README: peer sync single-peer env var table; Topology C compose example updated to use env vars only (no config file needed for two-node setup) - README: document cybercinch/coredns_mysql_extend built-in file caching — serves from cache during MySQL outages, eliminates per-query round-trips