commit 4c365b8c added 1106 CCCL device-level headers (294K lines) to
qwen3_6_scripts/cccl_preload/include/. These are NOT used by the allocator
preload (which only needs cub/util_allocator.cuh + 288 transitive deps)
and cannot compile on corex CUDA 10.2 anyway.
The extra headers doubled docker context from 15MB to 31MB, likely
causing platform build timeout or size limit failure.
Restoring to the original 288-header set that is proven to compile and run.
09d92dce5d