Add Core4 MLP G2 25k artifact core4_mlp_current_state_g2_step25000/open_box_lid_both_crop/README.md

core4_mlp_current_state_g2_step25000/open_box_lid_both_crop/README.md

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+# open_box_lid — Core4 MLP G2 @ 25k
+
+- File: `stage2_step25000.ckpt`
+- Norm: `norm_stats.json` (same run)
+- Policy: `DexFlowMLPPolicy`, action-only L1, chunk 30, no TE
+- Open-loop (10 train ep, chunk[0]): nRMSE41 0.054, body 0.0089 rad, hand MAE 3.01
+
+```python
+from dexflow.backbone.dexflow_mlp import DexFlowMLPPolicy
+model = DexFlowMLPPolicy.from_checkpoint("stage2_step25000.ckpt", stage="deploy")
+```