{
  "kind": "illustrative-preview",
  "issued": false,
  "signature": null,
  "subject": "synthetic-refund / fixture-v1",
  "constraint": "At most one refund effect per logical intent.",
  "method": "One deterministic lost-reply fault; two separately reset synthetic branches.",
  "assessment": "Violation illustrated by blind retry; reconciliation retains one synthetic effect.",
  "integrity": "Unsigned educational example; not a verification input.",
  "applicability": "Teaching fixture only; no real project certified.",
  "exclusions": ["Live providers", "Concurrency", "Real agents", "Production frequency"],
  "reproduction": "lost-ack.mjs"
}