Add an optional energy_attestation field: a content-id commitment to the raw
attestation-report bytes from sandbox-tee::energy, sealed into the signed
preimage via Efficiency::with_energy_attestation. Keeps the receipt crate free
of any attestation dependency — the receipt commits, the attestation layer
adjudicates trust (IntegrityAttested vs PhysicallyRooted), so the receipt never
asserts a level it cannot prove. MAPPING §4 documents the composed verification.
Round-trip test; example unchanged. No new deps.
Co-authored-by: Transaction Science <[email protected]>
Co-authored-by: Claude Opus 4.8 <[email protected]>
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