fix(iris): use marin-na bucket for CW state (matches R2 endpoint)

The object_storage_endpoint (74981a43...) belongs to the marin-na R2
account. marin-test lives on a different R2 account, causing
NoSuchBucket errors during cluster start.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: yonromai

lib/iris/examples/coreweave.yaml

@@ -35,10 +35,10 @@ platform:
     region: US-WEST-04A
     namespace: iris
     kubeconfig_path: ~/.kube/coreweave-iris  # Set this to your local kubeconfig, or use KUBECONFIG env var
-    object_storage_endpoint: https://a5a1f66f973e2196a26bae21c81b899b.r2.cloudflarestorage.com
+    object_storage_endpoint: https://74981a43be0de7712369306c7b19133d.r2.cloudflarestorage.com
 
 storage:
-  remote_state_dir: s3://marin-test/iris/state
+  remote_state_dir: s3://marin-na/iris/state
 
 controller:
   image: ghcr.io/marin-community/iris-controller:latest