fn key_from_full_binary()

in akd/src/append_only_zks.rs [59:64]

• 6 lines of code
• 3 McCabe index (conditional complexity)

    fn key_from_full_binary(bin: &[u8]) -> Result<u8, String> {
        if bin.is_empty() || bin[0] != StorageType::Azks as u8 {
            return Err("Not an AZKS key".to_string());
        }
        Ok(DEFAULT_AZKS_KEY)
    }