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/applications/README.md

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+# Railiance ArgoCD Tenant Applications
+
+This directory is synced by the `railiance-apps-root` ArgoCD Application.
+
+Tenant teams author a thin ArgoCD `Application` manifest against the contract
+in `docs/argocd-gitops.md`. Platform review merges that manifest here after
+checking namespace, repository, sync policy, and secret-delivery shape.
+
+Workload manifests stay in the owning tenant repo. The default source path for
+tenant workloads is:
+
+```text
+k8s/railiance/
+```
+
+Do not commit Kubernetes Secret values, ArgoCD repository credentials, OpenBao
+tokens, deploy keys, or API keys here.
+

argocd/applications/issue-core.application.yaml

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+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: issue-core
+  namespace: argocd
+  labels:
+    app.kubernetes.io/part-of: railiance-gitops
+    railiance.io/domain: issue-core
+  annotations:
+    argocd.argoproj.io/sync-wave: "10"
+spec:
+  project: railiance-tenants
+  source:
+    repoURL: https://gitea.coulomb.social/coulomb/issue-core.git
+    targetRevision: main
+    path: k8s/railiance
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: issue-core
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+    syncOptions:
+      - CreateNamespace=true
+      - ApplyOutOfSyncOnly=true
+      - PruneLast=true