federation.remove-node only edited nodes.json, so a removed/renamed node
(e.g. a stale "Arch HP") lingered in the mesh chat list with its old
thread. Capture the node's pubkey before removal, then purge its
synthetic mesh peer, shared secret, messages, presence, and persisted
contact entry via the new mesh::purge_federation_peer. Combined with the
#42 name refresh, stale federation contacts can now be fully cleaned from
a node.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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