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Chris Tsang
7864a702da
Five new cases exercising behavior rather than plumbing: - diagonal_touch_does_not_connect — regions are 4-connected; same-colored squares meeting at a corner stay separate basins. - nested_regions — frame/ring/core flat zones come out as three exact regions, and the holed ring face survives the mosaic. - volume_extinction_prefers_vivid_over_large — the hierarchy's ranking attribute: a 9 px black dot (volume ~1150) outlives a 100 px barely-different patch (volume ~400) when cutting to two regions. - plateaus_with_ramps — the antialiased-boundary shape: three plateaus joined by short ramps cut to three regions whose means stay near the plateau values; ramps neither form regions nor drag the means. - degenerate_geometries — 1x1, 16x1, and 1x16 images segment correctly. assert_stack additionally bounds the layer count by the merge tree (at most 2K-1 layers).