Tamper-evident AI-agent transaction audit corpus

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Tamper-evident AI-agent transaction audit corpus: for every agent-initiated spend, four linked records — an authorization record (policy decision allow / block / needs_review, policy ID, evaluated rules, written before any payment rail is called), an execution event (timestamp, rail, counterparty, outcome, or a block record), an Ed25519-signed receipt binding amount, currency, agent ID, policy decision, artifact hash and timestamp, and a public verification record. Transaction lineage links quote → policy evaluation → authorization → execution → receipt by transaction ID, and full lifecycle replay is stored