[
  {
    "id": "currency-basic",
    "regressionKind": "known-false-positive",
    "sourceReference": "Regression fixture: literal-currency control class",
    "sourceEvidence": "The approved source marks 84 as a literal price.",
    "input": "The fee is $84.",
    "expected": "valid",
    "issues": [],
    "segments": [
      {
        "type": "text",
        "value": "The fee is "
      },
      {
        "type": "currency",
        "value": "$84"
      },
      {
        "type": "text",
        "value": "."
      }
    ]
  },
  {
    "id": "inline-inequality",
    "regressionKind": "known-defect",
    "sourceReference": "Regression fixture: currency-versus-math misclassification class",
    "sourceEvidence": "The approved source provides an explicit inline equation.",
    "input": "Assume \\(0 < z < 10\\).",
    "expected": "valid",
    "issues": [],
    "segments": [
      {
        "type": "text",
        "value": "Assume "
      },
      {
        "type": "math-inline",
        "latex": "0 < z < 10"
      },
      {
        "type": "text",
        "value": "."
      }
    ]
  },
  {
    "id": "numeric-math",
    "regressionKind": "known-defect",
    "sourceReference": "Regression fixture: numeric-expression misclassification class",
    "sourceEvidence": "The approved source typesets the numeric sequence as an inline expression.",
    "input": "The ordered values are \\(28, 20\\).",
    "expected": "valid",
    "issues": [],
    "segments": [
      {
        "type": "text",
        "value": "The ordered values are "
      },
      {
        "type": "math-inline",
        "latex": "28, 20"
      },
      {
        "type": "text",
        "value": "."
      }
    ]
  },
  {
    "id": "mixed-currency-math",
    "regressionKind": "known-defect",
    "sourceReference": "Regression fixture: mixed currency and math class",
    "sourceEvidence": "The approved source identifies the price as currency and the inequality as math.",
    "input": "At $7,000, solve \\(2x - 6y > 12\\).",
    "expected": "valid",
    "issues": [],
    "segments": [
      {
        "type": "text",
        "value": "At "
      },
      {
        "type": "currency",
        "value": "$7,000"
      },
      {
        "type": "text",
        "value": ", solve "
      },
      {
        "type": "math-inline",
        "latex": "2x - 6y > 12"
      },
      {
        "type": "text",
        "value": "."
      }
    ]
  },
  {
    "id": "display-math",
    "regressionKind": "synthetic",
    "sourceReference": "Synthetic structured display-math baseline",
    "sourceEvidence": "The approved source contains one structured display equation block.",
    "input": "\\[x^2+y^2=25\\]",
    "expected": "valid",
    "issues": [],
    "segments": [
      {
        "type": "math-block",
        "latex": "x^2+y^2=25"
      }
    ]
  },
  {
    "id": "currency-inside-explicit-math",
    "regressionKind": "known-defect",
    "sourceReference": "Regression fixture: escaped currency inside math class",
    "sourceEvidence": "The approved source provides one explicit inline expression containing a currency unit.",
    "input": "\\(3.699\\ \\text{\\$/oz}\\)",
    "expected": "valid",
    "issues": [],
    "segments": [
      {
        "type": "math-inline",
        "latex": "3.699\\ \\text{\\$/oz}"
      }
    ]
  },
  {
    "id": "ambiguous-single-number",
    "regressionKind": "synthetic",
    "sourceReference": "Synthetic unresolved legacy-dollar scenario",
    "sourceEvidence": "Only a flat legacy string is available; no approved source classification was supplied.",
    "input": "The value is $5$.",
    "expected": "invalid",
    "issues": [
      {
        "type": "ambiguous-dollar",
        "reason": "Source context is required to distinguish currency from math."
      }
    ],
    "segments": [
      {
        "type": "unresolved",
        "value": "$5$",
        "reason": "Source context is required to distinguish currency from math."
      }
    ]
  },
  {
    "id": "unmatched-dollar",
    "regressionKind": "known-defect",
    "sourceReference": "Regression fixture: unmatched delimiter class",
    "sourceEvidence": "The flat legacy string contains an unmatched dollar sign and the approved source is unavailable.",
    "input": "The pool is $x feet wide.",
    "expected": "invalid",
    "issues": [
      {
        "type": "unmatched-dollar",
        "reason": "The delimiter cannot be resolved without the approved source."
      }
    ],
    "segments": [
      {
        "type": "unresolved",
        "value": "$x",
        "reason": "Unmatched delimiter requires source comparison."
      }
    ]
  },
  {
    "id": "bare-tex",
    "regressionKind": "known-defect",
    "sourceReference": "Regression fixture: bare TeX source-authoring class",
    "sourceEvidence": "The extracted prose contains a TeX command outside an explicit math segment.",
    "input": "The area is 8 \\cdot 7.",
    "expected": "invalid",
    "issues": [
      {
        "type": "bare-tex",
        "reason": "A TeX command appears in prose."
      }
    ],
    "segments": [
      {
        "type": "unresolved",
        "value": "\\cdot",
        "reason": "Compare with the approved source before classifying it."
      }
    ]
  },
  {
    "id": "structured-block-omission",
    "regressionKind": "known-defect",
    "sourceReference": "Regression fixture: structured prompt-block omission class",
    "sourceEvidence": "The canonical source contains two structured blocks while the rendered projection contains one.",
    "input": "Structured prompt projection",
    "expected": "invalid",
    "issues": [
      {
        "type": "structured-block-omission",
        "reason": "Rendered structured-block count differs from the source."
      }
    ],
    "sourceBlockCount": 2,
    "generatedBlockCount": 2,
    "renderedBlockCount": 1,
    "segments": [
      {
        "type": "unresolved",
        "value": "promptBlocks",
        "reason": "One structured block is missing from the rendered projection."
      }
    ]
  },
  {
    "id": "malformed-latex",
    "regressionKind": "synthetic",
    "sourceReference": "Synthetic hard-failure LaTeX validation scenario",
    "sourceEvidence": "The canonical typed math segment is syntactically incomplete.",
    "input": "\\(\\frac{1}{\\)",
    "expected": "invalid",
    "issues": [
      {
        "type": "malformed-latex",
        "reason": "A hard-failure KaTeX validation gate must reject the expression."
      }
    ],
    "segments": [
      {
        "type": "math-inline",
        "latex": "\\frac{1}{"
      }
    ]
  },
  {
    "id": "generated-drift",
    "regressionKind": "synthetic",
    "sourceReference": "Synthetic canonical-to-generated drift scenario",
    "sourceEvidence": "The generator's declared source and emitted artifact hashes differ from the expected projection.",
    "input": "Generated artifact comparison",
    "expected": "invalid",
    "issues": [
      {
        "type": "generated-drift",
        "reason": "The generated artifact does not reproduce the canonical source projection."
      }
    ],
    "sourceProjectionHash": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
    "generatedProjectionHash": "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
    "segments": [
      {
        "type": "text",
        "value": "Generated artifact comparison"
      }
    ]
  },
  {
    "id": "rendered-count-mismatch",
    "regressionKind": "synthetic",
    "sourceReference": "Synthetic expected-expression versus rendered-root mismatch scenario",
    "sourceEvidence": "The typed source declares one expression while the browser observation contains no KaTeX root.",
    "input": "\\(x+1\\)",
    "expected": "invalid",
    "issues": [
      {
        "type": "rendered-count-mismatch",
        "reason": "Expected math-expression count differs from rendered KaTeX-root count."
      }
    ],
    "expectedMathExpressionCount": 1,
    "renderedKatexRootCount": 0,
    "segments": [
      {
        "type": "math-inline",
        "latex": "x+1"
      }
    ]
  },
  {
    "id": "production-artifact-drift",
    "regressionKind": "synthetic",
    "sourceReference": "Synthetic verified-source versus packaged-artifact drift scenario",
    "sourceEvidence": "A student math data file changed by one byte during production packaging.",
    "input": "Production artifact comparison",
    "expected": "invalid",
    "issues": [
      {
        "type": "artifact-drift",
        "reason": "The packaged artifact does not match the verified source bytes or semantic projection."
      }
    ],
    "sourceProjectionHash": "cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc",
    "artifactProjectionHash": "dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd",
    "segments": [
      {
        "type": "text",
        "value": "Production artifact comparison"
      }
    ]
  },
  {
    "id": "raw-browser-math-syntax",
    "regressionKind": "synthetic",
    "sourceReference": "Synthetic learner-visible raw-math scenario",
    "sourceEvidence": "The typed projection contains one math expression, but the browser exposes its source delimiters instead of a KaTeX root.",
    "input": "The answer is $x+2$.",
    "expected": "invalid",
    "issues": [
      {
        "type": "raw-browser-math-syntax",
        "reason": "Learner-visible text contains raw math delimiters outside a KaTeX root."
      }
    ],
    "expectedMathExpressionCount": 1,
    "renderedKatexRootCount": 0,
    "segments": [
      {
        "type": "math-inline",
        "latex": "x+2"
      }
    ]
  }
]