Feat/gap9 training power collection - #41
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…ime dispatch Output-stationary ConvGradX (dX): for each dX position accumulate the full (co,ky,kx) reduction in a register and write dX once, instead of the scatter kernel's Cout*K read-modify-writes into dX (an FPU-stalled dependent chain). The gather needs dY fully readable, so it is only correct when the conv is NOT spatially tiled. A runtime numeric tile-vs-full-dim check falls back to the scatter kernel for spatially-split convs (e.g. ResNet8 single-buffer), so it is correct on every config while taking the fast path on promote+DB. The template captures the untiled output dims (alignToContext, pre-tiling) and passes them. ResNet8 GAP9 GVSoC, golden (Errors 0/4): promote+DB 51.9M/step (gather, vs scatter 68M); single-buffer 55.0M/step (dispatch->scatter for split convs). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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