config: default critical_curves_method to zero_contour

marching_squares fabricates a noisy polygonal radial caustic for slope=2
isothermal profiles where the radial eigenvalue never cleanly crosses zero.
zero_contour correctly omits the degenerate radial caustic and renders clean
smooth ovals when one physically exists.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: 2 people

autogalaxy/config/visualize/general.yaml

@@ -5,7 +5,7 @@ general:
   log10_min_value: 1.0e-4
   log10_max_value: 1.0e99
   zoom_around_mask: true
-  critical_curves_method: marching_squares
+  critical_curves_method: zero_contour
 inversion:
   reconstruction_vmax_factor: 0.5
   total_mappings_pixels: 8