Restore hysteresis previews on dataset card

Restores the original v1 hysteresis figure at the top of the unified dataset card and adds the v2 multiaxial hysteresis preview, while retaining the model comparison figure.

README.md

@@ -17,6 +17,8 @@ size_categories:
 
 # AgentFEM Material Loading Memory
 
+![Material loading-memory hysteresis](artifacts/t2_material_loading_memory_v1/hysteresis_preview.png)
+
 An open, reproducible research dataset for path-dependent material modeling,
 neural constitutive surrogates and finite-element deployment tests. The
 repository now contains two compatible releases.
@@ -43,6 +45,8 @@ for the original v1 release.
 - six model families evaluated under three frozen protocols;
 - element-level deployment in a controlled notched-bar finite-element gate.
 
+![Multiaxial hysteresis examples](artifacts/t2_multiaxial_ood_v2/multiaxial_hysteresis_preview.png)
+
 Stress RMSE on held-out trajectories:
 
 | Model | ID | Path OOD | Parameter OOD |

SHA256SUMS

@@ -2,7 +2,7 @@
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