fix(infra): pin CI sensor pod to DEV1-L platform nodes

The Argo Events sensor had no nodeSelector and randomly landed on the
H100 GPU node, preventing autoscale-down. Pin it to DEV1-L to avoid
wasting expensive GPU node hours on a lightweight event listener.

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

infra/k8s/argo/events/ci-pipeline-sensor.yaml

@@ -9,6 +9,8 @@ metadata:
 spec:
   template:
     serviceAccountName: argo-workflow
+    nodeSelector:
+      node.kubernetes.io/instance-type: DEV1-L
   eventBusName: default
   dependencies:
     - name: gitlab-push-dep