chore: add changelog entry for dictionary membership optimization

Author: christopherrya

.changes/unreleased/Under the Hood-20251120-175803.yaml

@@ -0,0 +1,5 @@
+kind: Under the Hood
+body: Optimize dictionary membership checks by replacing 'in dict.keys()' with 'in dict' for better performance
+time: $(date -u +"%Y-%m-%dT%H:%M:%S.%N%z" | sed 's/\(..\)$/:\1/')
+custom:
+    Author: christopherrya

.changes/unreleased/Under the Hood-20251120-175805.yaml

@@ -0,0 +1,5 @@
+kind: Under the Hood
+body: Optimize dictionary membership checks by replacing 'in dict.keys()' with 'in dict' for better performance
+time: 2025-11-21T01:58:05.215680000+00:00
+custom:
+    Author: christopherrya