The previous version had a `portioned_smem_per_warp` field that doesn't
exist in CCCL. The actual CCCL RadixSortOnesweepPolicy has:
threads, items, store_algorithm, rank_algorithm, scan_algorithm,
rank_private_partitions, radix_bits
Also adds proper SMEM calculation:
total = max(keys_tile, values_tile, rank_smem) + offsets
with 2KB headroom for kernel stack/locals.
rank_private_partitions set to 1 to minimize SMEM pressure.
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