Added

• SwarmHandle::dht() — exposes the underlying HyperDhtHandle for low-level DHT operations such as mutable/immutable record storage and manual peer lookup.
• SwarmHandle::key_pair() — exposes the Ed25519 key pair identifying this swarm node, for use with DHT mutable records or other identity operations.
• Re-exported HyperDhtHandle, MutablePutResult, MutableGetResult, and ImmutablePutResult from the peeroxide crate root, so callers no longer need to depend on peeroxide-dht directly for common DHT storage types.

Changed

• Swarm nodes now self-announce under hash(publicKey) during each discovery refresh. This populates ForwardEntry records on the nodes closest to the peer's public key, enabling PEER_HANDSHAKE routing to work correctly — matching the behaviour of the Node.js reference implementation.
• Server registrations are now cleaned up properly on leave() (when the last server topic is left), on destroy(), and when the swarm handle is dropped. Previously, ForwardEntry records for the local server could persist in the router until TTL expiry.
• Incoming server connections now reuse the DHT's bound listen socket for the UDX stream, rather than creating a new socket. This ensures streams arrive on the same port that remote peers have on record, fixing connection establishment in NAT environments.
• Handshake replies no longer echo the client's address back in peer_address; the field is now correctly set to None in the reply, matching the wire protocol.