Upload Table 3 properties fine-tune from joint checkpoint

Paper Table 3 artifact; not a production model. Zatom-2 properties fine-tuning initialized from joint force-conditioned pretraining. The checkpoint completes epoch 120: 80 pretraining epochs plus 40 fine-tuning epochs. Source epoch 119, global step 146352. SHA-256 5c12d4f631a4017ea5dacc3fe9704a34ef26c37ad46ebfa3b3a6c50f50e10bbf.

zatom2-table3-finetune-properties-from-joint-force-conditioned-epoch120.ckpt

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