test: use distinct icons for DevCats skills

Author: DevelopmentCats

registry/DevelopmentCats/skills/README.md

@@ -5,11 +5,11 @@ sources:
     skills:
       code-review:
         display_name: Code Review
-        icon: ../../../.icons/coder.svg
+        icon: ../../../.icons/claude.svg
         tags: [code-review, quality]
       git-workflow:
         display_name: Git Workflow
-        icon: ../../../.icons/coder.svg
+        icon: ../../../.icons/docker.svg
         tags: [git, workflow]
 ---