debug: add minimal flat test file for Setters diagnosis

Isolating whether Setters can find/update anything at all in this repo,
independent of the Deployment's nested containers[].image structure -
throwaway, will be removed once resolved.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Y4YNpuC2bgT224suQLLJ7B

apps/hello-app/setter-test.yaml

@@ -0,0 +1,8 @@
+# Throwaway diagnostic file - delete once the Setters investigation is done.
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: setter-test
+  namespace: hello-app
+data:
+  image: git.boglabob.com/codegit/hello-app:latest # {"$imagepolicy": "hello-app:hello-app"}