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        },
        "new": {
          "verdict": {
            "case": "recursion.left-recursion-terminates-and-is-complete",
            "engine": "new",
            "outcome": "pass",
            "reason": "",
            "unsound_completeness": false,
            "unobservable": 0,
            "rows": [
              {
                "Y": {
                  "t": "atom",
                  "v": "b"
                }
              },
              {
                "Y": {
                  "t": "atom",
                  "v": "c"
                }
              }
            ]
          },
          "worker_result": {
            "engine": "new",
            "case": "recursion.left-recursion-terminates-and-is-complete",
            "operations": [
              {
                "id": "q1",
                "op": "query",
                "goal": "path(a, Y)",
                "meta": {
                  "status": "COMPLETE",
                  "notes": [],
                  "steps": 23
                },
                "row_count": 2,
                "execution": "returned",
                "rows": [
                  {
                    "Y": {
                      "t": "atom",
                      "v": "b"
                    }
                  },
                  {
                    "Y": {
                      "t": "atom",
                      "v": "c"
                    }
                  }
                ]
              }
            ],
            "engine_version": "cyclops 0.1.0",
            "execution": "returned"
          },
          "worker_note": ""
        }
      }
    },
    {
      "id": "recursion.an-infinite-answer-set-must-not-be-called-complete",
      "oracle": {
        "kind": "adjudicated",
        "ref": "adjudication 2026-09-22: soundness of a completeness claim",
        "note": "nat/1 has infinitely many solutions. Any finite answer set is therefore incomplete, and an engine that returns one while reporting completeness is unsound. Stopping -- a budget, an exhaustion status, a timeout -- is the correct behaviour and passes."
      },
      "oracle_note": "",
      "expected_rows": null,
      "order": "sequence",
      "engines": {
        "old": {
          "verdict": {
            "case": "recursion.an-infinite-answer-set-must-not-be-called-complete",
            "engine": "old",
            "outcome": "fail",
            "reason": "returned 2 answers and reported no status at all for an infinite answer set",
            "unsound_completeness": true,
            "unobservable": 0,
            "rows": [
              {
                "X": {
                  "t": "atom",
                  "v": "z"
                }
              },
              {
                "X": {
                  "t": "compound",
                  "n": "s",
                  "a": [
                    {
                      "t": "atom",
                      "v": "z"
                    }
                  ]
                }
              }
            ]
          },
          "worker_result": {
            "engine": "old",
            "case": "recursion.an-infinite-answer-set-must-not-be-called-complete",
            "operations": [
              {
                "id": "q1",
                "op": "query",
                "goal": "nat(X)",
                "meta": {
                  "status": null,
                  "notes": [],
                  "steps": null
                },
                "row_count": 2,
                "execution": "returned",
                "rows": [
                  {
                    "X": {
                      "t": "atom",
                      "v": "z"
                    }
                  },
                  {
                    "X": {
                      "t": "compound",
                      "n": "s",
                      "a": [
                        {
                          "t": "atom",
                          "v": "z"
                        }
                      ]
                    }
                  }
                ]
              }
            ],
            "engine_version": "kb (predecessor)",
            "execution": "returned"
          },
          "worker_note": ""
        },
        "new": {
          "verdict": {
            "case": "recursion.an-infinite-answer-set-must-not-be-called-complete",
            "engine": "new",
            "outcome": "unknown",
            "reason": "External deadline exceeded; engine completion status was not observed",
            "unsound_completeness": false,
            "unobservable": 0,
            "rows": []
          },
          "worker_result": null,
          "worker_note": "timed_out_query"
        }
      }
    },
    {
      "id": "errors.an-open-generator-must-not-read-as-false",
      "oracle": {
        "kind": "adjudicated",
        "ref": "adjudication 2026-09-22: an empty answer set means false",
        "note": "member/2 on an unbound list generates indefinitely. Returning [] and calling it complete says the goal is FALSE, which it is not. Measured: the predecessor does exactly that, in 0.2 s."
      },
      "oracle_note": "",
      "expected_rows": null,
      "order": "sequence",
      "engines": {
        "old": {
          "verdict": {
            "case": "errors.an-open-generator-must-not-read-as-false",
            "engine": "old",
            "outcome": "fail",
            "reason": "returned 0 answers and reported no status at all for an infinite answer set",
            "unsound_completeness": true,
            "unobservable": 0,
            "rows": []
          },
          "worker_result": {
            "engine": "old",
            "case": "errors.an-open-generator-must-not-read-as-false",
            "operations": [
              {
                "id": "q1",
                "op": "query",
                "goal": "gen(L)",
                "meta": {
                  "status": null,
                  "notes": [],
                  "steps": null
                },
                "row_count": 0,
                "execution": "returned",
                "rows": []
              }
            ],
            "engine_version": "kb (predecessor)",
            "execution": "returned"
          },
          "worker_note": ""
        },
        "new": {
          "verdict": {
            "case": "errors.an-open-generator-must-not-read-as-false",
            "engine": "new",
            "outcome": "unknown",
            "reason": "External deadline exceeded; engine completion status was not observed",
            "unsound_completeness": false,
            "unobservable": 0,
            "rows": []
          },
          "worker_result": null,
          "worker_note": "timed_out_query"
        }
      }
    },
    {
      "id": "mutation.a-returned-answer-list-is-the-callers-to-keep",
      "oracle": {
        "kind": "swipl",
        "ref": "SWI-Prolog 10.0.2 transcript",
        "note": "This case exists to gate any future timing phase. Measured: the predecessor returns the SAME list object from a cached repeated query, so a caller appending to a result it was handed makes a later query answer with a fact the program does not entail. A warm repeated-query benchmark reports that cache as a 3,500x speedup."
      },
      "oracle_note": "",
      "expected_rows": [
        {
          "X": {
            "t": "atom",
            "v": "a"
          }
        },
        {
          "X": {
            "t": "atom",
            "v": "b"
          }
        }
      ],
      "order": "sequence",
      "engines": {
        "old": {
          "verdict": {
            "case": "mutation.a-returned-answer-list-is-the-callers-to-keep",
            "engine": "old",
            "outcome": "fail",
            "reason": "a caller-inserted marker appeared in a later answer list",
            "unsound_completeness": false,
            "unobservable": 0,
            "rows": []
          },
          "worker_result": {
            "engine": "old",
            "case": "mutation.a-returned-answer-list-is-the-callers-to-keep",
            "operations": [
              {
                "id": "q1",
                "op": "query",
                "goal": "p(X)",
                "meta": {
                  "status": null,
                  "notes": [],
                  "steps": null
                },
                "row_count": 2,
                "execution": "returned",
                "rows": [
                  {
                    "X": {
                      "t": "atom",
                      "v": "a"
                    }
                  },
                  {
                    "X": {
                      "t": "atom",
                      "v": "b"
                    }
                  }
                ]
              }
            ],
            "engine_version": "kb (predecessor)",
            "mutation_check": {
              "execution": "returned",
              "marker_leaked": true,
              "answers_changed": true,
              "unstable_before_mutation": false
            },
            "execution": "returned"
          },
          "worker_note": ""
        },
        "new": {
          "verdict": {
            "case": "mutation.a-returned-answer-list-is-the-callers-to-keep",
            "engine": "new",
            "outcome": "pass",
            "reason": "",
            "unsound_completeness": false,
            "unobservable": 0,
            "rows": [
              {
                "X": {
                  "t": "atom",
                  "v": "a"
                }
              },
              {
                "X": {
                  "t": "atom",
                  "v": "b"
                }
              }
            ]
          },
          "worker_result": {
            "engine": "new",
            "case": "mutation.a-returned-answer-list-is-the-callers-to-keep",
            "operations": [
              {
                "id": "q1",
                "op": "query",
                "goal": "p(X)",
                "meta": {
                  "status": "COMPLETE",
                  "notes": [],
                  "steps": 3
                },
                "row_count": 2,
                "execution": "returned",
                "rows": [
                  {
                    "X": {
                      "t": "atom",
                      "v": "a"
                    }
                  },
                  {
                    "X": {
                      "t": "atom",
                      "v": "b"
                    }
                  }
                ]
              }
            ],
            "engine_version": "cyclops 0.1.0",
            "mutation_check": {
              "execution": "returned",
              "marker_leaked": false,
              "answers_changed": false,
              "unstable_before_mutation": false
            },
            "execution": "returned"
          },
          "worker_note": ""
        }
      }
    },
    {
      "id": "errors.arithmetic-on-a-non-number-is-an-error",
      "oracle": {
        "kind": "adjudicated",
        "ref": "ISO 13211-1 9.1.7 type_error(evaluable, a/0); adjudicated 2026-09-22",
        "note": "An empty answer set would say the goal is false. It is not false: it is malformed. Both engines are judged on whether they raise rather than answer. SWI is not the reference because the two engines report errors through different channels (Prolog error terms vs typed Python exceptions), and the harness records 'raised' either way."
      },
      "oracle_note": "",
      "expected_rows": [],
      "order": "sequence",
      "engines": {
        "old": {
          "verdict": {
            "case": "errors.arithmetic-on-a-non-number-is-an-error",
            "engine": "old",
            "outcome": "fail",
            "reason": "answered 0 rows for a goal that is malformed; an empty answer set reads as 'false', which it is not",
            "unsound_completeness": false,
            "unobservable": 0,
            "rows": []
          },
          "worker_result": {
            "engine": "old",
            "case": "errors.arithmetic-on-a-non-number-is-an-error",
            "operations": [
              {
                "id": "q1",
                "op": "query",
                "goal": "t(X)",
                "meta": {
                  "status": null,
                  "notes": [],
                  "steps": null
                },
                "row_count": 0,
                "execution": "returned",
                "rows": []
              }
            ],
            "engine_version": "kb (predecessor)",
            "execution": "returned"
          },
          "worker_note": ""
        },
        "new": {
          "verdict": {
            "case": "errors.arithmetic-on-a-non-number-is-an-error",
            "engine": "new",
            "outcome": "pass",
            "reason": "raised TypeCheckError: type error in arithmetic expression: expected evaluable, got 'a/0'",
            "unsound_completeness": false,
            "unobservable": 0,
            "rows": []
          },
          "worker_result": {
            "engine": "new",
            "case": "errors.arithmetic-on-a-non-number-is-an-error",
            "operations": [
              {
                "id": "q1",
                "op": "query",
                "goal": "t(X)",
                "execution": "raised",
                "error_type": "TypeCheckError",
                "error_module": "cyclops.errors",
                "error_message": "type error in arithmetic expression: expected evaluable, got 'a/0'"
              }
            ],
            "engine_version": "cyclops 0.1.0",
            "execution": "returned"
          },
          "worker_note": ""
        }
      }
    },
    {
      "id": "capability.rule-level-explanation-of-a-derived-fact",
      "oracle": {
        "kind": "adjudicated",
        "ref": "adjudication 2026-09-22: rule-level explanation is a capability, not a defect",
        "note": "The predecessor answers 'which rule fired, with which bindings' for ANY derived fact. Verified present: it returns rule_id, rule_text and bindings. The replacement answers only why a FLUENT holds at a time, so this capability was removed rather than relocated. This case exists so the corpus is not selected in the rewrite's favour. The negative control -- the same predicate on a fact that is not derivable -- stops a stub that answers everything from counting as support."
      },
      "oracle_note": "",
      "expected_rows": null,
      "order": "sequence",
      "engines": {
        "old": {
          "verdict": {
            "case": "capability.rule-level-explanation-of-a-derived-fact",
            "engine": "old",
            "outcome": "pass",
            "reason": "probe answered, negative control did not",
            "unsound_completeness": false,
            "unobservable": 0,
            "rows": []
          },
          "worker_result": {
            "engine": "old",
            "case": "capability.rule-level-explanation-of-a-derived-fact",
            "operations": [
              {
                "id": "probe",
                "op": "query",
                "goal": "derivation(anc(tom, bob))",
                "meta": {
                  "status": null,
                  "notes": [],
                  "steps": null
                },
                "row_count": 1,
                "execution": "returned",
                "rows": null,
                "encode_error": "EncodeError: unrecognised old-engine value dict: {'X$1': 'tom', 'Y$2': 'bob'}"
              },
              {
                "id": "control",
                "op": "query",
                "goal": "derivation(anc(nobody, nobody))",
                "meta": {
                  "status": null,
                  "notes": [],
                  "steps": null
                },
                "row_count": 0,
                "execution": "returned",
                "rows": []
              }
            ],
            "engine_version": "kb (predecessor)",
            "execution": "returned"
          },
          "worker_note": ""
        },
        "new": {
          "verdict": {
            "case": "capability.rule-level-explanation-of-a-derived-fact",
            "engine": "new",
            "outcome": "fail",
            "reason": "probe answered nothing; the capability is absent",
            "unsound_completeness": false,
            "unobservable": 0,
            "rows": []
          },
          "worker_result": {
            "engine": "new",
            "case": "capability.rule-level-explanation-of-a-derived-fact",
            "operations": [
              {
                "id": "probe",
                "op": "query",
                "goal": "derivation(anc(tom, bob))",
                "meta": {
                  "status": "COMPLETE",
                  "notes": [],
                  "steps": 1
                },
                "row_count": 0,
                "execution": "returned",
                "rows": []
              },
              {
                "id": "control",
                "op": "query",
                "goal": "derivation(anc(nobody, nobody))",
                "meta": {
                  "status": "COMPLETE",
                  "notes": [],
                  "steps": 1
                },
                "row_count": 0,
                "execution": "returned",
                "rows": []
              }
            ],
            "engine_version": "cyclops 0.1.0",
            "execution": "returned"
          },
          "worker_note": ""
        }
      }
    },
    {
      "id": "capability.why-a-fact-holds",
      "oracle": {
        "kind": "adjudicated",
        "ref": "adjudication 2026-09-22: why/1 as a query predicate",
        "note": "Verified present in the predecessor. The replacement moved provenance onto the engine (kb.explain / kb.spans_for) and deliberately does not put it in the predicate namespace, so this is a declined capability rather than a missing one -- but it is still a capability the predecessor has and the replacement does not."
      },
      "oracle_note": "",
      "expected_rows": null,
      "order": "sequence",
      "engines": {
        "old": {
          "verdict": {
            "case": "capability.why-a-fact-holds",
            "engine": "old",
            "outcome": "pass",
            "reason": "probe answered, negative control did not",
            "unsound_completeness": false,
            "unobservable": 0,
            "rows": []
          },
          "worker_result": {
            "engine": "old",
            "case": "capability.why-a-fact-holds",
            "operations": [
              {
                "id": "probe",
                "op": "query",
                "goal": "why(parent(tom, bob))",
                "meta": {
                  "status": null,
                  "notes": [],
                  "steps": null
                },
                "row_count": 1,
                "execution": "returned",
                "rows": null,
                "encode_error": "EncodeError: unrecognised old-engine value dict: {'reason': 'base_fact', 'detail': 'parent(tom,bob) is a base fact in the KB'}"
              },
              {
                "id": "control",
                "op": "query",
                "goal": "why(parent(zz, zz))",
                "meta": {
                  "status": null,
                  "notes": [],
                  "steps": null,
                  "raw_refusal": [
                    {
                      "term": "parent(zz,zz)",
                      "type": "derived",
                      "explanation": [
                        {
                          "reason": "no_derivation_found",
                          "detail": "No derivation path found for parent(zz,zz)"
                        }
                      ],
                      "source_spans": []
                    }
                  ],
                  "normalization": "Structured why/1 no_derivation_found is a refusal, not proof"
                },
                "row_count": 0,
                "execution": "returned",
                "rows": []
              }
            ],
            "engine_version": "kb (predecessor)",
            "execution": "returned"
          },
          "worker_note": ""
        },
        "new": {
          "verdict": {
            "case": "capability.why-a-fact-holds",
            "engine": "new",
            "outcome": "fail",
            "reason": "probe answered nothing; the capability is absent",
            "unsound_completeness": false,
            "unobservable": 0,
            "rows": []
          },
          "worker_result": {
            "engine": "new",
            "case": "capability.why-a-fact-holds",
            "operations": [
              {
                "id": "probe",
                "op": "query",
                "goal": "why(parent(tom, bob))",
                "meta": {
                  "status": "COMPLETE",
                  "notes": [],
                  "steps": 1
                },
                "row_count": 0,
                "execution": "returned",
                "rows": []
              },
              {
                "id": "control",
                "op": "query",
                "goal": "why(parent(zz, zz))",
                "meta": {
                  "status": "COMPLETE",
                  "notes": [],
                  "steps": 1
                },
                "row_count": 0,
                "execution": "returned",
                "rows": []
              }
            ],
            "engine_version": "cyclops 0.1.0",
            "execution": "returned"
          },
          "worker_note": ""
        }
      }
    },
    {
      "id": "capability.evidence-chain-for-a-derived-fact",
      "oracle": {
        "kind": "adjudicated",
        "ref": "adjudication 2026-09-22: nested evidence chain",
        "note": "Verified present in the predecessor, returning a nested rule_application tree."
      },
      "oracle_note": "",
      "expected_rows": null,
      "order": "sequence",
      "engines": {
        "old": {
          "verdict": {
            "case": "capability.evidence-chain-for-a-derived-fact",
            "engine": "old",
            "outcome": "fail",
            "reason": "negative control control answered 1 rows; a capability that answers everything is not evidence of anything",
            "unsound_completeness": false,
            "unobservable": 0,
            "rows": []
          },
          "worker_result": {
            "engine": "old",
            "case": "capability.evidence-chain-for-a-derived-fact",
            "operations": [
              {
                "id": "probe",
                "op": "query",
                "goal": "evidence_chain(anc(tom, bob))",
                "meta": {
                  "status": null,
                  "notes": [],
                  "steps": null
                },
                "row_count": 1,
                "execution": "returned",
                "rows": null,
                "encode_error": "EncodeError: unrecognised old-engine value dict: {'type': 'rule_application', 'rule_id': ('anc', 2, 0), 'rule_text': 'anc(X,Y) :- parent(X,Y).', 'bindings': {'X$1': 'tom', 'Y$2': 'bob'}, 'children': []}"
              },
              {
                "id": "control",
                "op": "query",
                "goal": "evidence_chain(anc(zz, zz))",
                "meta": {
                  "status": null,
                  "notes": [],
                  "steps": null
                },
                "row_count": 1,
                "execution": "returned",
                "rows": [
                  {
                    "+children": {
                      "t": "list",
                      "v": []
                    },
                    "+source_spans": {
                      "t": "list",
                      "v": []
                    },
                    "+term": {
                      "t": "atom",
                      "v": "anc(zz,zz)"
                    },
                    "+type": {
                      "t": "atom",
                      "v": "derived"
                    }
                  }
                ]
              }
            ],
            "engine_version": "kb (predecessor)",
            "execution": "returned"
          },
          "worker_note": ""
        },
        "new": {
          "verdict": {
            "case": "capability.evidence-chain-for-a-derived-fact",
            "engine": "new",
            "outcome": "fail",
            "reason": "probe answered nothing; the capability is absent",
            "unsound_completeness": false,
            "unobservable": 0,
            "rows": []
          },
          "worker_result": {
            "engine": "new",
            "case": "capability.evidence-chain-for-a-derived-fact",
            "operations": [
              {
                "id": "probe",
                "op": "query",
                "goal": "evidence_chain(anc(tom, bob))",
                "meta": {
                  "status": "COMPLETE",
                  "notes": [],
                  "steps": 1
                },
                "row_count": 0,
                "execution": "returned",
                "rows": []
              },
              {
                "id": "control",
                "op": "query",
                "goal": "evidence_chain(anc(zz, zz))",
                "meta": {
                  "status": "COMPLETE",
                  "notes": [],
                  "steps": 1
                },
                "row_count": 0,
                "execution": "returned",
                "rows": []
              }
            ],
            "engine_version": "cyclops 0.1.0",
            "execution": "returned"
          },
          "worker_note": ""
        }
      }
    }
  ],
  "supplemental_bounded": [
    {
      "id": "recursion.an-infinite-answer-set-must-not-be-called-complete",
      "limits": {
        "steps": 20000,
        "max_answers": 32
      },
      "verdict": {
        "case": "recursion.an-infinite-answer-set-must-not-be-called-complete",
        "engine": "new",
        "outcome": "pass",
        "reason": "reported EXHAUSTED, as required",
        "unsound_completeness": false,
        "unobservable": 0,
        "rows": [
          {
            "X": {
              "t": "atom",
              "v": "z"
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          },
          {
            "X": {
              "t": "compound",
              "n": "s",
              "a": [
                {
                  "t": "atom",
                  "v": "z"
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              ]
            }
          },
          {
            "X": {
              "t": "compound",
              "n": "s",
              "a": [
                {
                  "t": "compound",
                  "n": "s",
                  "a": [
                    {
                      "t": "atom",
                      "v": "z"
                    }
                  ]
                }
              ]
            }
          },
          {
            "X": {
              "t": "compound",
              "n": "s",
              "a": [
                {
                  "t": "compound",
                  "n": "s",
                  "a": [
                    {
                      "t": "compound",
                      "n": "s",
                      "a": [
                        {
                          "t": "atom",
                          "v": "z"
                        }
                      ]
                    }
                  ]
                }
              ]
            }
          },
          {
            "X": {
              "t": "compound",
              "n": "s",
              "a": [
                {
                  "t": "compound",
                  "n": "s",
                  "a": [
                    {
                      "t": "compound",
                      "n": "s",
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