Function run_doctor 

async fn run_doctor(
    key_address: Option<Address>,
    root_account: Option<Address>,
    to: Option<Address>,
    selector: Option<[u8; 4]>,
    recipient: Option<Address>,
    fee_token: Option<Address>,
    tempo: TempoOpts,
    rpc: RpcOpts,
) -> Result<()>

cast keychain doctor — diagnose access-key signing failures.