Fast hand key test files

• Original synthetic clip (MP4)
• Parameter sheet (CSV)
• Per-frame alpha readings (CSV)
• Reproduction script (CJS)
• Download all files (ZIP)

Unzip and run node reproduce.cjs --csv with FFmpeg on PATH. The script measures the supplied clip and writes the frame readings to the CSV. Test environment was Node 24.22.1 and FFmpeg N-126374-g089a48eb36-20260831. Frame and pixel coordinates start at zero.

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