Function decode_call_operation_metadata 

pub fn decode_call_operation_metadata(
    body: &[u8],
    limits: Limits,
) -> Result<CallOperationMetadata, CodecError>

Decodes descriptor-independent call_operation routing metadata.

Reference shape is validated, but scope ancestry and scope_ref identity are left to Host resolution so NotFound, validator failures, and InterfaceMismatch retain their protocol precedence.