Mongodb Ismaster Scram Sha256 Speculative Auth Admin

Issues an isMaster (hello handshake) command that includes helloOk:true and attempts speculative authentication using the SCRAM-SHA-256 mechanism against the admin database, advertising supported SASL mechanisms (admin.admin) and providing client metadata indicating the official MongoDB Go driver running on Linux (amd64), likely from a containerized environment. This primitive reflects early-stage authentication negotiation and capability probing during connection establishment.