Upstream creates /var/lib/mautrix-discord at mode 0770 owned by
mautrix-discord:mautrix-discord, but only adds matrix-synapse to the
mautrix-discord-registration supplementary group. That left synapse
unable to traverse the directory to read discord-registration.yaml,
crashing matrix-synapse on startup.

dhtclient only announces to the DHT. lassie (and IPNI/cid.contact)
never learned about neoprism's pins, so all fetchIpfs calls fell back
to archive.org. autoclient keeps DHT client mode but also pushes
provider records to IPNI via HTTP, making content discoverable by
lassie without a fallbackUrl.

ns1.first-ns.de, robotns2.second-ns.de, robotns3.second-ns.com