{
  "synthetic": true,
  "scope": "Invented teaching records; not a vendor export, bank-format compatibility test or accounting decision.",
  "old_text": "SYNTHETIC source A\nR1,2026-02-03,SALE,100.00\nR2,2026-02-04,FEE,-10.00\n",
  "new_text": "SYNTHETIC source B\nR1,2026-02-03,SALE,105.00\nR2,2026-02-04,FEE,-15.00\n",
  "old_sha256": "009232db3920a25cfe48f4b49d44a6c1cb4dc23f3baedbee3f86a92b81a277bb",
  "new_sha256": "014efe8c9635be7cd50f9c4d42fc56fb9588cbe6aadf0c1ad22b33b06d027935",
  "observed_unified_diff": [
    "--- original-text",
    "+++ replacement-text",
    "@@ -1,3 +1,3 @@",
    "-SYNTHETIC source A",
    "-R1,2026-02-03,SALE,100.00",
    "-R2,2026-02-04,FEE,-10.00",
    "+SYNTHETIC source B",
    "+R1,2026-02-03,SALE,105.00",
    "+R2,2026-02-04,FEE,-15.00"
  ],
  "net_each": 90,
  "method": "Python difflib on two invented text files, not Acrobat PDF comparison or a banking correction."
}