Upload completed Stage 2 checkpoints

metrics/stage2_step_0048000_metrics.json

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+{
+  "metrics": {
+    "eval/decoded_mse": 0.016940660774707794,
+    "eval/decoded_psnr": 23.731296452380782,
+    "eval/latent_loss": 0.2177485466003418,
+    "eval/latent_mse": 0.38936851978302,
+    "eval/num_images": 100.0
+  },
+  "step": 48000
+}