Blockle 0.2.4 — P2P hygiene

Clean peer discovery for the now-live network: dial logs fire once per real dial instead of flooding every tick, loopback/wildcard addresses are never gossiped or dialed (nodes could previously connect to themselves via gossiped 127.0.0.1), and a route-probe guard stops a node dialing its own public address. Fully wire-compatible with 0.2.3 peers. Recommended update for everyone running a wallet or node.