PNG luminance array evidence

The formal cohort contains six complete fresh workers on the existing 48-image public KITTI fixture. Its separate six-worker pilot overlapped validation; pilot/measurement-context.json records that limitation. No worker or warmup is discarded within either cohort. Report the cohorts separately.

Both controls use the same installed Pillow and NumPy. The rows control includes conversion into the array required by its consumer. Scope is PNG-to-array reads, with parent process times recorded separately; calibration is excluded. Raw PNG images and LiDAR scans are not redistributed. Input hashes are in each original protocol. Each frozen source capsule contains the 401 measured Python modules. Launcher bytes are preserved as text. The audit never executes either archive.

python -m tools.benchmark_png_array --audit docs/assets/png_array_decoding/formal
python -m tools.benchmark_png_array --audit docs/assets/png_array_decoding/pilot

inventory.json binds the exact archive file set and hashes. validation.json records numerical, calibration and fixed-toolchain verification. See the scope and timings.