Add ArgoCD GitOps bootstrap contract for railiance01

Define platform-owned AppProjects, root app-of-apps, repository registration
templates, and tenant onboarding docs so issue-core can deploy via ArgoCD.
Ignore encrypted repository secrets locally and cross-link OpenBao delivery
guidance with the new GitOps contract.

argocd/bootstrap/01-railiance-tenants-project.yaml

@@ -0,0 +1,52 @@
+apiVersion: argoproj.io/v1alpha1
+kind: AppProject
+metadata:
+  name: railiance-tenants
+  namespace: argocd
+  labels:
+    app.kubernetes.io/part-of: railiance-gitops
+    railiance-platform/component: gitops
+spec:
+  description: Guardrails for Railiance tenant applications deployed by ArgoCD.
+  sourceRepos:
+    - https://gitea.coulomb.social/coulomb/*.git
+  destinations:
+    - server: https://kubernetes.default.svc
+      namespace: "*"
+  clusterResourceWhitelist:
+    - group: ""
+      kind: Namespace
+  namespaceResourceWhitelist:
+    - group: ""
+      kind: ConfigMap
+    - group: ""
+      kind: PersistentVolumeClaim
+    - group: ""
+      kind: Secret
+    - group: ""
+      kind: Service
+    - group: ""
+      kind: ServiceAccount
+    - group: apps
+      kind: Deployment
+    - group: apps
+      kind: StatefulSet
+    - group: autoscaling
+      kind: HorizontalPodAutoscaler
+    - group: batch
+      kind: CronJob
+    - group: batch
+      kind: Job
+    - group: external-secrets.io
+      kind: ExternalSecret
+    - group: networking.k8s.io
+      kind: Ingress
+    - group: networking.k8s.io
+      kind: NetworkPolicy
+    - group: traefik.io
+      kind: IngressRoute
+    - group: traefik.io
+      kind: Middleware
+  orphanedResources:
+    warn: true
+