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/versions.tf

@@ -0,0 +1,15 @@
+terraform {
+  required_version = ">= 1.5"
+
+  required_providers {
+    kubernetes = {
+      source  = "hashicorp/kubernetes"
+      version = "~> 2.33"
+    }
+  }
+}
+
+provider "kubernetes" {
+  config_path    = var.kubeconfig
+  config_context = var.kube_context
+}