debug: test ImageUpdateAutomation with repo-root update.path

Diagnostic change - narrower ./apps/hello-app path never found anything
to update despite a byte-verified-correct marker, matching ImagePolicy
resolution, and no RBAC/duplicate-resource issues. Testing whether the
nested path itself is the problem before looking further.

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

apps/hello-app/image-automation.yaml

@@ -53,5 +53,5 @@ spec:
     push:
       branch: main
   update:
-    path: ./apps/hello-app
+    path: ./
     strategy: Setters