perf: push the interpreted hot loops further + add CI#1

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claude/elegant-gates-8etn3x

Commits on Jun 13, 2026

perf: speed up the interpreted pixel hot loops (bit-identical output)
claude
committed
perf: word-level bit packing in detector/binarizer + per-scale luminance reuse
claude
committed
perf: fuse the downsample greyscale into one repeat-for-each pass
claude
committed
Revert the fused downsample: it regressed STEP 2 (5073ms -> 7757ms)
claude
committed
perf: add opt-in ENGINE_RESAMPLE fast path (compiled downsample)
claude
committed
fix: don't let ENGINE_RESAMPLE break compilation on engines without resizeImage
claude
committed