Agent host: the VM is now nisse, not nisse-host

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01J5Utyfzw7gF7UhjRDEtjTk

scripts/agent-host.sh

@@ -7,9 +7,9 @@
 # Trusts only the host keys bot-ansible posted (~/bin/tofu-wait.sh saved them).
 set -euo pipefail
 
-host=${AGENT_HOST:-nisse-host.garrett-hall.com}
+host=${AGENT_HOST:-nisse.garrett-hall.com}
 key=${AGENT_HOST_KEY:-/root/nisse-e2e/ssh/id_ed25519}
-known=${AGENT_HOST_KNOWN:-/root/nisse-e2e/nisse-host.known_hosts}
+known=${AGENT_HOST_KNOWN:-/root/nisse-e2e/nisse.known_hosts}
 repo=$(cd "$(dirname "$0")/.." && pwd)
 
 on_host() {