dig-peer 0.2.0

The DIG Network peer client: DigPeer::connect(peer, tls) drives dig-nat's full direct→relay traversal ladder, exposes typed RPC over dig-rpc-protocol, seals directed calls end-to-end to the peer's captured BLS-G1 identity (§5.4) on top of mTLS, and disconnects cleanly. The client mirror of dig-rpc's server; distinct from ChiaPeer.