feat(hslm): double-buffered batch prefetch#563
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- Add src/b2t/double_buffer.zig - Generic DoubleBufferedPrefetch(T, N): comptime-sized double buffer with swap/loadFromSlice/isBackReady - BatchPrefetcher: runtime batch loader for training data with async prefetch, swap, batch count - Overlaps data loading with training: while GPU processes buffer A, CPU prefetches into buffer B - 6 tests: swap, double swap, fail-safety, batch load, out-of-range, async prefetch+swap, batch count Closes #319
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Summary
Double-buffered batch prefetch to overlap data loading with training.
New file
src/b2t/double_buffer.zig— 229 LOCPerformance
DoubleBufferedPrefetch(T, N)for comptime-sized buffersBatchPrefetcherfor variable batch sizesFeatures
DoubleBufferedPrefetch: generic comptime double buffer with swap/load/readyBatchPrefetcher: batch-stride-aware loader with async prefetchloadBatch(): blocking load + swapprefetchAsync(): non-blocking load into back bufferswap(): switch active/back buffersbatchCount(): compute number of batches in datasetTests (6)
Closes #319