feat: add IaC layer with shared var/t1 and var/t3 data paths

Ansible provisions the k3d cluster and Flux controllers; Terraform
modules deploy the simulated fleet and ground warehouse. Compose and
k3d share var/t1 (live lake) and var/t3 (warehouse). The prototype
gains a live mode fed by the explorer read-only SQL API.

infra/terraform/sim-env/outputs.tf

@@ -0,0 +1,23 @@
+output "explorer_url" {
+  description = "Data-plane explorer (partition tree + read-only SQL)"
+  value       = "http://localhost:${var.node_ports.explorer}"
+}
+
+output "grafana_url" {
+  description = "Grafana dashboards"
+  value       = "http://localhost:${var.node_ports.grafana}"
+}
+
+output "prometheus_url" {
+  description = "Prometheus"
+  value       = "http://localhost:${var.node_ports.prometheus}"
+}
+
+output "fleet" {
+  description = "Deployed fleet shape"
+  value = {
+    drones            = var.drone_count
+    flight_duration_s = var.flight_duration_s
+    speedup           = var.speedup
+  }
+}