Add teardown script

scripts/teardown.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+# Tear the demo down. Do this between rebuilds and after the recording so you
+# stop paying for Fargate / AgentCore.
+set -euo pipefail
+cd "$(dirname "$0")/.."
+
+REGION="${REGION:-us-east-1}"
+
+echo "==> Delete AgentCore resources (adjust names to what agentcore_setup created)"
+echo "    agentcore runtime delete --name hncb-advisor-agent --region ${REGION} || true"
+echo "    agentcore gateway delete --name hncb-rag-gateway   --region ${REGION} || true"
+
+echo "==> Terraform destroy (DynamoDB, Lambda, ECS, IAM)"
+terraform -chdir=terraform destroy -auto-approve
+
+echo "==> (optional) delete the Presidio ECR repo"
+echo "    aws ecr delete-repository --repository-name hncb-presidio --force --region ${REGION} || true"
+
+echo "Teardown complete (mind any S3/CloudFront you created for the UI)."