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    "The Result Card includes an engine-linked figure of f around the published root (marker is pack.root on y=0; Newton/secant seeds and the bisection bracket are read from inputs, not REST fields). Same fnValue as REST/MCP. Iterate history is not a REST field.",
    "Not CAS / not complex roots listed",
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    "Polynomial degree ≤ 8",
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    "No convergence → NO_CONVERGENCE"
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    "unknown method (including cas, halley) → INVALID_MODE",
    "no convergence → NO_CONVERGENCE",
    "eˣ=0 has no finite real root → NO_CONVERGENCE"
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