docs(fc-build-windows): capture runner operator gate

apps/fc-build-windows/operator-gate-configmap.yaml

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+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: fc-build-windows-operator-gate
+  namespace: kubevirt-vms
+  labels:
+    app.kubernetes.io/name: fc-build-windows
+    app.kubernetes.io/component: operator-gate
+    app.kubernetes.io/part-of: github-runner
+    flowercore.io/q-card: Q-MR-82
+  annotations:
+    flowercore.io/outcome: OPEN-WITH-OPERATOR-ACTION
+    flowercore.io/live-runner: "false"
+data:
+  outcome: OPEN-WITH-OPERATOR-ACTION
+  gate.md: |
+    Do not treat this ConfigMap as runner capacity.
+
+    Current probe, 2026-05-20:
+    - RKE2 nodes are linux-only; Windows containers require a Windows node.
+    - KubeVirt `ci1` is Running/Ready, but RDP 3389, WinRM 5985, and SSH 22
+      through `virtctl port-forward` return `connect: no route to host`.
+    - GitHub Updater runner list has only `bluejay-ws-sandbox-1`, status
+      offline. Updater Windows Sandbox E2E run 26150689447 remains queued.
+
+    Required operator action:
+    1. Make a dedicated Windows VM reachable and durable.
+    2. Install .NET 10 SDK, .NET 8 Desktop Runtime, Git, VS Build Tools, and
+       PowerShell 7.
+    3. Register repo-scoped runners with short-lived GitHub registration tokens.
+    4. Add `fc-build-windows` labels only to WPF build-capable guests.
+    5. Add `windows-sandbox` labels only after Sandbox support is proven.
+  registration-token-pattern.ps1: |
+    $repo = "FlowerCore.Updater"
+    $token = gh api -X POST "/repos/astoltz/$repo/actions/runners/registration-token" --jq .token
+    $runnerDir = "C:\fc-ghr\updater-fc-build-windows"
+
+    New-Item -ItemType Directory -Force -Path $runnerDir | Out-Null
+    Set-Location $runnerDir
+
+    # Install the Actions runner package here if config.cmd is absent.
+    .\config.cmd `
+      --url "https://github.com/astoltz/$repo" `
+      --token $token `
+      --name "ci1-updater-fc-build-windows" `
+      --labels "self-hosted,windows,fc-build-windows,ci1" `
+      --work "_work" `
+      --unattended `
+      --replace
+
+    .\svc.ps1 install
+    .\svc.ps1 start
+  verification.ps1: |
+    gh api /repos/astoltz/FlowerCore.Updater/actions/runners `
+      --jq '.runners[] | {name,status,busy,labels:[.labels[].name]}'
+
+    gh run list --repo astoltz/FlowerCore.Updater `
+      --workflow "Updater Windows Sandbox E2E" --limit 3
+
+    $env:KUBECONFIG="$env:USERPROFILE\.kube\rke2.yaml"
+    kubectl -n kubevirt-vms get vm,vmi,pods -o wide