Fine line restore test files

• Original line on green (PNG)
• Starting cutout and its alpha mask (PNG)
• Brush parameters and counts (CSV)
• Reproduction script
• All files (ZIP)

Extract the ZIP and run node reproduce.cjs --csv with FFmpeg on PATH. Use --generate to recreate the fixture and the three previews. Tested with Node 24.22.1 and FFmpeg N-126374-g089a48eb36-20260831. Coordinates start at the upper-left pixel, zero-based.

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