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Replace the sklearn PCA and StandardScaler in Correlation.plot_pca with a scipy/numpy SVD implementation, reproducing sklearn's output (column standardization with population std, deterministic svd_flip sign convention, explained_variance_ from singular values). Drop the now-unused pandas and scikit-learn dependencies. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Replace the sklearn PCA and StandardScaler in Correlation.plot_pca with a scipy/numpy SVD implementation, reproducing sklearn's output (column standardization with population std, deterministic svd_flip sign convention, explained_variance_ from singular values). Drop the now-unused pandas and scikit-learn dependencies.