Guard large unaligned Qwen expert gathers

docs/issue110-sorted-gather/allocation.jsonl

@@ -0,0 +1,2 @@
+{"case":"allocation_refusal","limit":1,"partial_peak":4096,"released":true,"retry_exact":true}
+{"case":"allocation_refusal","limit":2,"partial_peak":151552,"released":true,"retry_exact":true}