Add spectrum reconstruction plot

README.md

@@ -63,11 +63,12 @@ NativeSpecZ-296M_Submission/
 ├── eval/
 │   ├── desi_heldout/  sdss/  vipers/   (summary.json + NPZ predictions + multi_mask.json)
 └── plots/
-    ├── scatter_redshift.png
-    ├── scatter_3datasets.png
-    ├── comparison_296m_76m_aion.png
-    ├── multi_mask_reconstruction.png
-    └── stress_curve.png
+    ├── scatter_redshift.png            (predicted vs true z, DESI)
+    ├── scatter_3datasets.png           (z scatter on DESI/SDSS/VIPERS)
+    ├── spectrum_reconstruction.png     (4-panel masked-region reconstruction overlay)
+    ├── comparison_296m_76m_aion.png    (MAE bars vs 76M and AION)
+    ├── multi_mask_reconstruction.png   (rec MSE vs mask ratio, line vs continuum)
+    └── stress_curve.png                (instrument-shift robustness)
 ```
 
 ## Note on loading