Retrain: best of 4 seeds (seed=43). Critical F1 0.667 -> 0.699, precision 0.558 -> 0.604, recall held at 0.829. Overall test_f1 0.6746 -> 0.7225.

Remove stale training_metrics.json from prior checkpoint

Retrain with class-weighted loss + corrected acute-negation labels (critical recall 0.486 -> 0.829)

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initial commit