chore/ablation - #57
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The loss was hardcoded as mlm_loss + alpha * contrastive_loss, so the MLM term always contributed with weight 1. Add mlm_weight (default 1.0) to make the MLM side controllable, enabling the contrastive-only ablation.
Four ablation configs for CodeBERT: mlm-only (alpha=0), contrastive-only (mlm_weight=0), no self-contrast, and InfoNCE (vs SupCon control).
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