feat: hotpatch playbook with SIGHUP restart + Always pull policy

Replace scale 0→1 in biscayne-hotpatch.yml with SIGHUP to the agave
container's PID 1. Only the agave container restarts — the other 4
containers in the pod stay running.

Change imagePullPolicy from IfNotPresent to Always for kind clusters.
With the local registry on localhost:5001, the pull is fast and ensures
container restarts always pick up the latest image.

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

Author: AFDudley

stack_orchestrator/deploy/k8s/deploy_k8s.py

@@ -463,9 +463,7 @@ def _create_volume_data(self):
 
     def _create_deployment(self):
         """Create the k8s Deployment resource (which starts pods)."""
-        deployment = self.cluster_info.get_deployment(
-            image_pull_policy=None if self.is_kind() else "Always"
-        )
+        deployment = self.cluster_info.get_deployment(image_pull_policy="Always")
         if self.is_kind():
             self._rewrite_local_images(deployment)
         if opts.o.debug: