Fix polynom-roots.cpp - #238
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Laguerre's method requires H = G^2 - p''(x)/p(x), but the code computed G^2 - p''(x) - p(x). A stress test against polynomials with known random complex roots (degrees 2-10) failed in 202/300 trials before the fix and 0/300 after. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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