cuda-ab: blk512 - minimal 2-D-grid CTA band-bug reproducer

w512<<<8,512>>> writes 16384 ints out[i]=i perfectly (bad=0 across
repeated runs); w256<<<(16,4),(16,16)>>> with the same write does
bad=12288 deterministically: rows 0..15 correct, rows >= 16 wrong. This is
the transformer/row-band failure without any probe machinery, and the host
scan reports the engine wrote 31/31 tracked pages for the failing launch,
i.e. the by>=1 stores exist but do not reach the pages the client reads.
Build: nvcc -O2 --cudart=static -arch=sm_75 -o blk512 blk512.cu

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