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Serverless private channels and DMs are made private by encryption (no
server to enforce access). Messages are NIP-17 gift-wrapped (kind 1059)
to every member; the relay only sees opaque blobs addressed by #p.
- crate::encrypted: build_gift_wraps (one per member) + unwrap_gift
- send_channel_message: routes serverless DM/private channels through
encryption (rumor=kind9 with h tag -> seal -> wrap per member)
- decrypt_gift_wrap command + relayClient encrypted fetch/subscribe
(query kind1059 #p=me, decrypt, route by inner h tag)
- proven end-to-end over wss://relay.damus.io (group A->{A,B,C}, B reads)
Agent-side gift-wrap support (sprout-acp) follows separately.