[#54] --flatten-shading: collapse soft shading so gradients stop shattering#57
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Smooth/photographic gradients (e.g. satin sheen) otherwise shatter into many tiny 'scratch' facets. --flatten-shading runs a stronger edge-preserving bilateral pass (larger color + spatial sigma) in preprocess so the soft shading collapses into clean flat regions before tracing — fewer facets, much smaller file, at the cost of fine shading (opt-in, color mode). Parametrizes flatten_colors' spatial sigma and points the photographic-gradients warning at the new flag. On the glossy-anime test: 6084 → 3319 paths, satin scratch gone. Closes #54 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Per the re-scope to Option 2:
--flatten-shadingruns a stronger edge-preserving bilateral pass before tracing, so smooth/glossy gradients (satin sheen) collapse into clean flat regions instead of shattering into tiny scratch facets. Opt-in, color mode; trades fine shading for a cleaner graphic look + much smaller file.flatten_colorsspatial sigma; the flag sets a strong flatten (sigma_color 0.18, spatial 8).(Options 1 = SVG gradient fills and 3 = postprocess sliver-merge were ruled out empirically — see the issue thread.)
Closes #54
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