Add exact D10 single-term convergence certificate - #10
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Adds a class-number-10 convergence certificate for discriminant -13843. The C program independently counts reduced forms, scans fundamental discriminants through class number 10, verifies an exact degree-10 factor of H_{-13843}(x^3), solves the principal real C=j^(1/3) root, and reports the asymptotic single-term gain |j|/1728. It deliberately certifies convergence structure only; it does not claim a globally fastest finite 1/pi series because the Borwein family has arbitrarily increasing convergence as class number/discriminant grows.