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Image Trace: preset trace counts measured on current main

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The anchor, pixel-difference and staircase figures for the new preset
values are measured again with JPEG block smoothing and the Limited
palette change in main. 16 Colors makes 20% fewer anchors, and Low
Fidelity Photo leaves 96 staircases of 2 px steps where it left 77.
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@@ -259,9 +259,10 @@ leaves 1.4 specks (was 0.5), and Outline's stroked centre lines lie 0.095 px off
anchors a stroke (was 3.0). ΔE changes by 0.01 or less except Line Art and Outline (2.62 and 2.61 to 2.66
and 2.67); edge ΔE rises in 8 of the 12, for example 4.79 to 5.25 (16 Colors), 3.98 to 4.46 (3 Colors) and 9.46 to 10.03
(Black and White Logo). On synthetic shapes and photos of 300 to 4,000 px traced outside this harness,
High Fidelity Photo makes 41% fewer anchors and 16 Colors 15% fewer; the mean pixel difference of each
trace changes by −0.23 to +0.25 of a level; 16 Colors leaves 91 staircases of steps of 2 px or more where it left 85, and High
Fidelity Photo 473 where it left 461. The tables below are the previous measurement, not a rerun.
High Fidelity Photo makes 41% fewer anchors and 16 Colors 20% fewer; the mean pixel difference of each
trace changes by −0.23 to +0.26 of a level; 16 Colors leaves 41 staircases of steps of 2 px or more where it left 40, High
Fidelity Photo 440 where it left 391, and Low Fidelity Photo 96 where it left 77. The tables below are the previous
measurement, not a rerun.
Test: `presets_have_their_paths_corners_and_noise` in `crates/trace/src/tests.rs`.
## A simpler contour walk