test: fix NVFP4 mega_moe test dimensions for SMEM alignment

patches/test_nvfp4_mega_moe.py

@@ -9,12 +9,14 @@ import os
 import sys
 
 def test_nvfp4_mega_moe():
-    # Small but aligned dimensions
+    # Use dimensions that satisfy all alignment requirements:
+    # - hidden and intermediate_hidden must be multiples of 128 and 64
+    # - block_m will be at least 32 (SMEM alignment: 32 * 64 = 2048 >= 1024)
     num_experts = 2
-    num_tokens = 8       # must be multiple of alignment (8 for block_m=8)
+    num_tokens = 32       # must be multiple of alignment
     top_k = 2
-    hidden = 256         # must be multiple of 128 and 64
-    intermediate_hidden = 512  # must be multiple of 128 and 64
+    hidden = 512          # multiple of 128 and 64
+    intermediate_hidden = 1024  # multiple of 128 and 64
 
     device = "cuda"
     torch.cuda.set_device(0)