Fix scale assembly output shape: reshape to 2D for GEMM

vllm/nvfp4_cutedsl.py

@@ -235,7 +235,10 @@ class CuTeDSLMoERunner:
         
         all_flat = torch.cat([p.view(torch.uint8) for p in swizzled_parts], dim=0)
         all_flat = all_flat.view(torch.float8_e4m3fn)
-        return all_flat
+        # Reshape to 2D: (total_padded_rows, padded_cols)
+        total_padded_rows = padded_expert_offsets[num_experts].item()
+        padded_cols = swizzled_parts[0].shape[1] if swizzled_parts else padded_x_sf_buf.shape[1]
+        return all_flat.reshape(total_padded_rows, padded_cols)
 
     def compute_activation_global_scales(self, hidden_states_sample, topk_weights, topk_ids):
         """Compute activation global scales from a warmup forward pass.