The backend already sends did in federation peer lists, but the Peer
type omitted it and federationNodeToPeer() dropped it when mapping. Add
did?: string to Peer and pass node.did through, so trusted/observer
node rows route to Federation/Mesh by their real DID (falling back to
pubkey/onion) instead of failing the build on a missing property.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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