Extrapolate to the infinite lattice and test the 2% target

Extrapolate to the infinite lattice and test the 2% target

Fit the three peak temperatures against inverse lattice size, extrapolate to the infinite-size limit, and compare against the exact zero-field critical temperature of the two-dimensional Ising model. Deliverable: A fit report with the extrapolated value, its uncertainty, the relative difference from the exact value, and a pass or fail at 2%.