{
  "schema": "pg36-ch35-classification-contract-v1",
  "required_packet_fields": [
    "case_id",
    "observed_at",
    "checksum",
    "relation",
    "collation",
    "amcheck",
    "business"
  ],
  "routes": [
    {
      "route": "RESTORE_FROM_KNOWN_GOOD_COPY",
      "requires": [
        "checksum.enabled = true",
        "checksum.offline_bad_checksums >= 1",
        "relation.kind = heap",
        "collation.version_mismatch = false"
      ],
      "safe_action": "preserve the corrupted clone and recover a new working copy from a verified source",
      "forbidden_shortcut": "ignore the checksum or zero the damaged page on the evidence copy"
    },
    {
      "route": "REINDEX_AND_REFRESH_COLLATION",
      "requires": [
        "checksum.offline_bad_checksums = 0",
        "collation.version_mismatch = true",
        "amcheck.structural_check_passed = true",
        "relation.kind = index-derived"
      ],
      "safe_action": "on a working copy, reindex the exact dependent index before refreshing collation metadata",
      "forbidden_shortcut": "refresh version metadata without rebuilding affected derived objects"
    }
  ],
  "unknown_route": {
    "route": "STOP_AND_ESCALATE",
    "when": "neither or both route predicates match",
    "actions": [
      "preserve original evidence",
      "stop writes and repeated experiments",
      "name missing facts and recovery sources",
      "escalate before dangerous recovery parameters"
    ]
  },
  "production_ch35_gate": "pending"
}