Function protocol_config 

pub fn protocol_config() -> Config

How Vectorizer uses the Thunder wire — the client half of the server’s vectorizer_config(): vectorizer scheme, AUTH-command handshake, no HELLO negotiation (the HELLO command is Vectorizer’s own), RESP3-style error prefixes.

Declared here rather than imported from the server so the SDK depends only on registry crates — cargo publish rejects path dependencies.