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/00-railiance-bootstrap-project.yaml

@@ -0,0 +1,22 @@
+apiVersion: argoproj.io/v1alpha1
+kind: AppProject
+metadata:
+  name: railiance-bootstrap
+  namespace: argocd
+  labels:
+    app.kubernetes.io/part-of: railiance-gitops
+    railiance-platform/component: gitops
+spec:
+  description: Platform-owned ArgoCD bootstrap project for Railiance app-of-apps.
+  sourceRepos:
+    - https://gitea.coulomb.social/coulomb/railiance-platform.git
+  destinations:
+    - server: https://kubernetes.default.svc
+      namespace: argocd
+  clusterResourceWhitelist: []
+  namespaceResourceWhitelist:
+    - group: argoproj.io
+      kind: Application
+  orphanedResources:
+    warn: true
+