CUDA kernel launches via cudarc::launch_builder and MappedF32::new
(cuMemHostAlloc DEVICEMAP FFI) inherently require unsafe blocks. The
workspace-wide '-W unsafe-code' lint produced ~80 warnings across these
files, all structurally identical. Match the established pattern from
ml-backtesting/src/harness.rs and ml-backtesting/src/sim/mod.rs: single
file-level allow with a comment explaining the rationale.
Files: alpha_dqn_h600_smoke, alpha_baseline, cublaslt_debug,
gpu_walk_forward, cuda_pipeline/mod, hyperopt adapters (mamba2, ppo),
DQN smoke_tests (helpers, td_propagation), trainers/ppo, and two
ml/tests files. Documented in dqn-wire-up-audit.md.
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