Function compose_e8_embedding 

pub fn compose_e8_embedding(
    operand: &KappaLabel<71>,
) -> Result<AddressOutcome<71>, CompositionFailure>

CS-E8 under σ-axis Sha256Hasher.

Errors

• CompositionFailure::OperandSigmaAxisMismatch — an operand’s σ-axis prefix is not "sha256".
• CompositionFailure::MalformedOperand — an operand is not a well-formed κ-label.
• CompositionFailure::PipelineFailure — defensive.