reviewItemEvidence
Phase 8: the item's deterministic evidence packet (versioned JSON envelope: item core + immutable access_snapshot + effective_policy/policy_lineage + timing/expiry facts + ALL steps + the full event timeline + the remediation/re-application block, with a content_sha256 over the canonical serialization — generated_at excluded from the hash). Admin-gated like reviewItem (review.item.read); reviewers never reach it.
reviewItemEvidence(
id: ID!
): JSON!