Function read_server_rails 

pub fn read_server_rails<R>(
    r: &mut R,
    want: usize,
) -> Result<Vec<VerbsServerParams>, Error>
where
    R: Read,

2026-09-26: Read want rails of VerbsServerParams framed by a leading [u8 n_rails]. Fails when the framed count is 0, above 8, or not want.