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/gitops/flux/kustomization-ground.yaml

@@ -0,0 +1,14 @@
+apiVersion: kustomize.toolkit.fluxcd.io/v1
+kind: Kustomization
+metadata:
+  name: ground-segment
+  namespace: flux-system
+spec:
+  interval: 2m
+  sourceRef:
+    kind: GitRepository
+    name: swarm-house
+  path: ./infra/gitops/ground
+  prune: true
+  wait: true
+  timeout: 3m