debug: clean up Setters investigation debris

Remove the throwaway setter-test.yaml and revert update.path to
./apps/hello-app. Root cause of ImageUpdateAutomation never committing a
tag update remains unresolved after exhausting marker syntax, path
scoping, field structure, namespace placement, RBAC, and version
compatibility as candidates - all checked out fine individually. Moving
on to docs/04-tofu.md; may retest after Flux gets a fresh bootstrap
against the new cluster there.

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: ./
+    path: ./apps/hello-app
     strategy: Setters

apps/hello-app/setter-test.yaml

@@ -1,27 +0,0 @@
-# Throwaway diagnostic file - delete once the Setters investigation is done.
-# Testing whether a same-namespace-as-ImageUpdateAutomation ImagePolicy
-# resolves differently than the existing cross-namespace one.
-apiVersion: image.toolkit.fluxcd.io/v1
-kind: ImagePolicy
-metadata:
-  name: hello-app-samens-test
-  namespace: flux-system
-spec:
-  imageRepositoryRef:
-    name: hello-app
-    namespace: hello-app
-  policy:
-    numerical:
-      order: asc
-  filterTags:
-    pattern: '^main-[a-f0-9]+-(?P<ts>\d+)$'
-    extract: '$ts'
----
-apiVersion: v1
-kind: ConfigMap
-metadata:
-  name: setter-test
-  namespace: hello-app
-data:
-  image: git.boglabob.com/codegit/hello-app:latest # {"$imagepolicy": "hello-app:hello-app"}
-  image_samens: git.boglabob.com/codegit/hello-app:latest # {"$imagepolicy": "flux-system:hello-app-samens-test"}