jgrusewski
b5d9da136a
merge: HtoD→mapped-pinned migration batch 2 (HOT collector/DT/portfolio, 18 sites)
Agent 2 — HOT-path migrations: bar_indices + feature_mask in
gpu_experience_collector, scratch.adam_t in decision_transformer (per-backward
4-byte HtoD eliminated), actions in gpu_portfolio simulate_batch_gpu.
3 commits, 18 sites total. Persistent MappedXxxBuffer fields for HOT-path
buffers (allocate once at ctor, host_slice_mut per call). Cargo check clean
(11 warnings — 2 unrelated baseline warnings disappeared as side-effect).
Per feedback_no_htod_htoh_only_mapped_pinned.md — second of 3 parallel batches.