[#52] --transparent-background: region-based background removal#56
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…nt SVG Reuses the region-based _edge_flood_fill_mask (shared with --solid-background) to cut the edge-connected background from the final color SVG: each path is mapped into the mask (applying its translate) and dropped when it covers the whole canvas or its outline sits mostly in the background. Region-based, so a subject that shares the background color is preserved (e.g. light hair, unlike deleting paths by color). Runs after the verify loop, so scoring is unaffected. Color mode only (binary/pixel line-art is already foreground-only). Verified on a real chibi illustration: clean transparent cutout, full hair kept. Closes #52 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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--transparent-background: cut the edge-connected background from a color conversion, leaving a transparent SVG._edge_flood_fill_mask([#53,#51] Region-based bg segmentation: fix solid-bg holes + --background <color> #55) — region-based, not color-based, so a subject sharing the bg color (e.g. light hair) is preserved. Deleting paths by color removed the hair in the earlier manual workaround; this does not.Closes #52
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