Outcome balance and naive baseline check

Compute Outcome class counts and percentages, then calculate majority-class baseline accuracy.
Explain in 4 points why accuracy alone is insufficient for this dataset.

Open the repository's notebook and locate the Outcome column and the existing model or dataset analysis. Add the class counts, percentages, majority-class baseline accuracy, and four points explaining why accuracy alone is insufficient; verify that the reported values match the dataset.

Written by the indexing model from the issue text.