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Code Review

This pull request updates system tests for K-Means, PCA, and ARIMA models. Key changes include implementing helper functions to sort categorical lists to ensure test stability, increasing relative tolerance (rtol) for PCA tests to accommodate numerical drift, and adding missing metrics to ARIMA score tests. Feedback highlights a potential logic error in the ARIMA test where the expected Mean Absolute Scaled Error is set to 0.0 despite non-zero RMSE, and identifies code duplication between the K-Means and PCA test files, suggesting that the categorical sorting logic should be centralized in a shared utility module.