Jito Searcher gRPC Service
gRPC SearcherService exposing SubscribeBundleResults, SendBundle, GetNextScheduledLeader, GetConnectedLeaders, GetConnectedLeadersRegioned, GetTipAccounts, and GetRegions. Authenticated via the AuthService challenge + token-refresh flow. The native interface used by Jito's official Rust, TypeScript, Python, and Go searcher clients.