add news fragment

suberlak · suberlak · commit c03a86ab1c03 · 2026-01-20T04:32:52.000Z
diff --git a/doc/news/DM-53862.feature.md b/doc/news/DM-53862.feature.md
@@ -0,0 +1,4 @@
+Add sigma-clipping to ``calculateSN`` in ``CutOutDonutsBaseTask`` to make
+signal-to-noise ratio estimates robust against unmasked hot pixels. A new
+``SN_clipped`` metadata field is now available and should be preferred for
+donut quality filtering.
