Mesh peer pubkeys (LoRa advert ed25519) differ from federation node
pubkeys (archipelago identity), so matching on pubkey always missed
and attachments >160B had no transport. Match on master DID instead;
also accept an explicit peer_onion override from the frontend, which
resolves the peer by display name against federation.list-nodes.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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