Exact-size D2H for compressed codecs#137
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Per-LOD exact-size bulk D2H instead of worst-case envelope. CODEC_NONE keeps kick-time bulk D2H (no BW to save; pipelining preserved). Compressed codecs sync on chunk-index in drain, then dispatch exact per-LOD transfers — recovers ~6× on
d2h_best_msfor zstd workloads.Filed #135 for a pre-existing latent bug surfaced during review.