Flakey CI fix (pytorch#21110)

Author: metascroy

examples/models/qwen3_5_moe/test_chunked_prefill.py

@@ -113,7 +113,10 @@ def test_chunked_prefill_matches_unchunked(self):
             logits_chunk.to(torch.float32),
             logits_full.to(torch.float32),
             rtol=1e-2,
-            atol=1e-2,
+            # cross-hardware MLX accumulation noise on near-zero logits (the
+            # greedy-token assert above is the functional guard; a real chunk-
+            # boundary desync would diverge by orders of magnitude more)
+            atol=3e-2,
         )