runners: add github-runner Deployments for DeviceManagement + AiStation.Linux + WorldBuilder

Morning-routine 2026-05-26 — these three repos had ZERO online Linux PR-CI
capacity, blocking the Sprint 37 Cx-1 Linux-CI-migration PRs (DM #20/#21/
#22, AiStation.Linux #13, WorldBuilder #3/#4). Chicken-and-egg: the
migration PRs need Linux runners that the migration creates.

Each Deployment uses the same canonical emptyDir-only pattern as the
fresh-2026-05-26 updater deployment that lives just above:
  - replicas: 2 (room for parallel PR-CI without head-of-line blocking)
  - per-pod emptyDir caches (no RWO PVC contention)
  - shared github-runner-token secret (existing ACCESS_TOKEN PAT has
    org-wide read access)
  - LABELS: self-hosted,linux,fc-build-linux
  - DOTNET_INSTALL_DIR pinned per ADR-170 family

For AiStation.Linux specifically: Linux job will now pick up; the
Windows job in #13 remains queued indefinitely until the Windows runner
host substrate lands per Sprint 36 v2 Cl-2 / ADR-174 — that's a separate
arc, not this PR.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/github-runner/Dockerfile

@@ -12,6 +12,15 @@ ENV PATH="/home/runner/_tool/Ruby/${RUBY_MINOR}/x64/bin:/opt/runner-toolcache/Ru
 
 USER root
 
+# Bake the IAmWorkin step-ca root CA into the system trust store. Without
+# this, .NET HttpClient calls from CI tests against *.iamworkin.lan
+# (e.g. https://selenium.iamworkin.lan/session) fail with `PartialChain`
+# because the runner image's default Ubuntu trust bundle doesn't include
+# our internal Root CA. update-ca-certificates regenerates
+# /etc/ssl/certs/ca-certificates.crt, which OpenSSL + .NET on Linux read
+# automatically — no SSL_CERT_FILE env var needed.
+COPY step-ca-root.crt /usr/local/share/ca-certificates/iamworkin-step-ca-root.crt
+
 RUN apt-get update \
     && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
         autoconf \
@@ -31,6 +40,7 @@ RUN apt-get update \
         pkg-config \
         uuid-dev \
         zlib1g-dev \
+    && update-ca-certificates \
     && curl -fsSL "https://github.com/rbenv/ruby-build/archive/refs/tags/${RUBY_BUILD_VERSION}.tar.gz" -o /tmp/ruby-build.tar.gz \
     && mkdir -p /tmp/ruby-build \
     && tar -xzf /tmp/ruby-build.tar.gz --strip-components=1 -C /tmp/ruby-build \

apps/github-runner/README.md

@@ -7,7 +7,7 @@ Deployments with `kubectl`; update this manifest and let ArgoCD reconcile.
 
 All repo-scoped Linux runners use:
 
-- `localhost/fc-github-runner:v20260520-ruby3.3.11`, derived from
+- `localhost/fc-github-runner:v20260525-ruby3.3.11-stepca`, derived from
   `myoung34/github-runner:latest`
 - `ACCESS_TOKEN` from the `github-runner-token` Secret
 - `RUN_AS_ROOT=false`
@@ -40,14 +40,26 @@ still mounts an `emptyDir` over `/home/runner`, so the `setup-runner-home` init
 container copies the baked toolcache from `/opt/runner-toolcache/Ruby` into
 `/home/runner/_tool/Ruby` before the runner container starts.
 
+The IAmWorkin step-ca root CA is also baked into the system trust store
+(`/usr/local/share/ca-certificates/iamworkin-step-ca-root.crt`, registered by
+`update-ca-certificates`). Without it, .NET HttpClient calls from CI tests
+against `*.iamworkin.lan` (e.g. `https://selenium.iamworkin.lan/session`)
+fail with `PartialChain`. To refresh the bundled cert when the root rotates,
+re-extract from the cluster and overwrite `step-ca-root.crt`:
+
+```bash
+kubectl get secret -n cert-manager step-ca-root \
+  -o jsonpath='{.data.ca\.crt}' | base64 -d > step-ca-root.crt
+```
+
 ```bash
 cd apps/github-runner
-podman build -t localhost/fc-github-runner:v20260520-ruby3.3.11 .
+podman build -t localhost/fc-github-runner:v20260525-ruby3.3.11-stepca .
-podman run --rm localhost/fc-github-runner:v20260520-ruby3.3.11 ruby -v
+podman run --rm localhost/fc-github-runner:v20260525-ruby3.3.11-stepca ruby -v
-podman run --rm localhost/fc-github-runner:v20260520-ruby3.3.11 \
+podman run --rm localhost/fc-github-runner:v20260525-ruby3.3.11-stepca \
   test -f /opt/runner-toolcache/Ruby/3.3/x64.complete
-podman save localhost/fc-github-runner:v20260520-ruby3.3.11 \
+podman save localhost/fc-github-runner:v20260525-ruby3.3.11-stepca \
-  -o fc-github-runner-v20260520-ruby3.3.11.tar
+  -o fc-github-runner-v20260525-ruby3.3.11-stepca.tar
 ```
 
 Import the saved image on every schedulable RKE2 node before ArgoCD rolls the
@@ -55,9 +67,9 @@ Deployments:
 
 ```bash
 for node in rke2-server rke2-agent1 rke2-agent2; do
-  scp fc-github-runner-v20260520-ruby3.3.11.tar "$node:/tmp/"
+  scp fc-github-runner-v20260525-ruby3.3.11-stepca.tar "$node:/tmp/"
-  ssh "$node" 'sudo ctr -a /run/k3s/containerd/containerd.sock -n k8s.io images rm localhost/fc-github-runner:v20260520-ruby3.3.11 || true'
+  ssh "$node" 'sudo ctr -a /run/k3s/containerd/containerd.sock -n k8s.io images rm localhost/fc-github-runner:v20260525-ruby3.3.11-stepca || true'
-  ssh "$node" 'sudo ctr -a /run/k3s/containerd/containerd.sock -n k8s.io images import /tmp/fc-github-runner-v20260520-ruby3.3.11.tar'
+  ssh "$node" 'sudo ctr -a /run/k3s/containerd/containerd.sock -n k8s.io images import /tmp/fc-github-runner-v20260525-ruby3.3.11-stepca.tar'
 done
 ```
 

apps/github-runner/step-ca-root.crt

@@ -0,0 +1,12 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

apps/selenium/network-policy.yaml

@@ -24,7 +24,16 @@
 #     (10.0.57.16:5200), public internet 80/443 (excluding RFC1918), and
 #     fc-signage:5190 for the signage AAT lane.
 #   - Ingress: Traefik (4444 + 8089 ACME-solver-style), intra-pod,
-#     telephony / gitea / fc-system / fc-signage namespaces on 4444.
+#     telephony / gitea / fc-system / fc-signage / github-runner namespaces
+#     on 4444.
+#
+# 2026-05-25: added github-runner ingress on 4444 so CI jobs running in
+# self-hosted runner pods (e.g. FlowerCore.Print.Web `help-screenshots`)
+# can reach the grid. Without this allow, the session POST to
+# `selenium-hub.selenium.svc.cluster.local:4444` was DNAT'd to the hub
+# pod IP and then dropped at the Calico ingress hook — Selenium UI showed
+# 0/4 sessions while the .NET HTTP client timed out at 60s. Same family
+# as `feedback_netpol_dnat_backend_port`, wrong-source-namespace flavor.
 apiVersion: networking.k8s.io/v1
 kind: NetworkPolicy
 metadata:
@@ -203,6 +212,13 @@ spec:
     ports:
     - port: 4444
       protocol: TCP
+  - from:
+    - namespaceSelector:
+        matchLabels:
+          kubernetes.io/metadata.name: github-runner
+    ports:
+    - port: 4444
+      protocol: TCP
   podSelector: {}
   policyTypes:
   - Ingress

apps/selenium/selenium-grid.yaml

@@ -0,0 +1,427 @@
+# Selenium Grid 4 — RKE2 deployment
+#
+# Hub + chrome + firefox + edge browser nodes serving fleet-wide AAT runs from
+# the GitHub Actions self-hosted runners. ArgoCD owns this namespace from
+# 2026-05-25 (`infra-selenium` Application; previously these resources were
+# orphan kubectl-applied since 2026-03-15).
+#
+# Endpoints:
+#   - Internal cluster: http://selenium-hub.selenium.svc.cluster.local:4444
+#   - LAN LoadBalancer (MetalLB): http://10.0.56.208:4444
+#   - Traefik public: https://selenium.iamworkin.lan
+#
+# Browser maxSessions:
+#   - chrome 2  (bumped from 1 on 2026-05-25 morning-routine — AAT-heavy
+#                Print.Web help-screenshots was the global bottleneck;
+#                see commit history for ops/runner-replica-rightsize)
+#   - firefox 1
+#   - edge 1
+#
+# Screenshots + video recording write to NFS via the chrome video sidecar.
+# See: CLAUDE.md "Selenium Grid & Visual AAT Testing" + bluejay-infra ADR notes.
+---
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app: selenium-hub
+    app.kubernetes.io/name: selenium-hub
+    app.kubernetes.io/part-of: selenium-grid
+  name: selenium-hub
+  namespace: selenium
+spec:
+  ports:
+  - name: web
+    port: 4444
+    targetPort: 4444
+  - name: publish
+    port: 4442
+    targetPort: 4442
+  - name: subscribe
+    port: 4443
+    targetPort: 4443
+  selector:
+    app: selenium-hub
+  type: ClusterIP
+---
+apiVersion: v1
+kind: Service
+metadata:
+  annotations:
+    metallb.io/ip-allocated-from-pool: bluejay-pool
+    metallb.universe.tf/loadBalancerIPs: 10.0.56.208
+  labels:
+    app: selenium-hub
+    component: external-access
+  name: selenium-hub-external
+  namespace: selenium
+spec:
+  clusterIP: 10.43.90.147
+  clusterIPs:
+  - 10.43.90.147
+  externalTrafficPolicy: Local
+  healthCheckNodePort: 32213
+  ports:
+  - name: web
+    nodePort: 32411
+    port: 4444
+    targetPort: 4444
+  - name: publish
+    nodePort: 32068
+    port: 4442
+    targetPort: 4442
+  - name: subscribe
+    nodePort: 31000
+    port: 4443
+    targetPort: 4443
+  selector:
+    app: selenium-hub
+  type: LoadBalancer
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: selenium-hub
+    app.kubernetes.io/name: selenium-hub
+    app.kubernetes.io/part-of: selenium-grid
+  name: selenium-hub
+  namespace: selenium
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: selenium-hub
+  template:
+    metadata:
+      labels:
+        app: selenium-hub
+        app.kubernetes.io/name: selenium-hub
+        app.kubernetes.io/part-of: selenium-grid
+    spec:
+      containers:
+      - env:
+        - name: SE_NODE_SESSION_TIMEOUT
+          value: '300'
+        - name: SE_SESSION_REQUEST_TIMEOUT
+          value: '300'
+        - name: SE_SESSION_RETRY_INTERVAL
+          value: '5'
+        - name: JAVA_OPTS
+          value: -Xmx512m
+        image: selenium/hub:4.27.0
+        livenessProbe:
+          httpGet:
+            path: /wd/hub/status
+            port: 4444
+          initialDelaySeconds: 30
+          periodSeconds: 15
+          timeoutSeconds: 5
+        name: selenium-hub
+        ports:
+        - containerPort: 4444
+          name: web
+        - containerPort: 4442
+          name: publish
+        - containerPort: 4443
+          name: subscribe
+        readinessProbe:
+          httpGet:
+            path: /wd/hub/status
+            port: 4444
+          initialDelaySeconds: 10
+          periodSeconds: 5
+          timeoutSeconds: 5
+        # Hub baseline working set ~766Mi on 2026-05-25 (75% of prior 1Gi
+        # limit). Bump to 1.5Gi / 1Gi to keep ~50% headroom; matches the
+        # stampede-buffer pattern documented for multus
+        # (feedback_k8s_cni_multus_sizing). CPU left alone — observed 54m
+        # against a 500m limit, no contention.
+        resources:
+          limits:
+            cpu: 500m
+            memory: 1536Mi
+          requests:
+            cpu: 250m
+            memory: 1Gi
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: selenium-node-chrome
+    app.kubernetes.io/name: selenium-node-chrome
+    app.kubernetes.io/part-of: selenium-grid
+  name: selenium-node-chrome
+  namespace: selenium
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: selenium-node-chrome
+  template:
+    metadata:
+      labels:
+        app: selenium-node-chrome
+        app.kubernetes.io/name: selenium-node-chrome
+        app.kubernetes.io/part-of: selenium-grid
+    spec:
+      containers:
+      - env:
+        - name: SE_EVENT_BUS_HOST
+          value: selenium-hub
+        - name: SE_EVENT_BUS_PUBLISH_PORT
+          value: '4442'
+        - name: SE_EVENT_BUS_SUBSCRIBE_PORT
+          value: '4443'
+        - name: SE_NODE_MAX_SESSIONS
+          value: '2'
+        - name: SE_NODE_OVERRIDE_MAX_SESSIONS
+          value: 'false'
+        - name: SE_VNC_NO_PASSWORD
+          value: '1'
+        - name: SE_SCREEN_WIDTH
+          value: '1920'
+        - name: SE_SCREEN_HEIGHT
+          value: '1080'
+        - name: SE_NODE_SESSION_TIMEOUT
+          value: '300'
+        image: selenium/node-chrome:4.27.0
+        livenessProbe:
+          httpGet:
+            path: /status
+            port: 5555
+          initialDelaySeconds: 30
+          periodSeconds: 15
+        name: selenium-chrome
+        ports:
+        - containerPort: 5555
+          name: node
+        readinessProbe:
+          httpGet:
+            path: /status
+            port: 5555
+          initialDelaySeconds: 15
+          periodSeconds: 5
+        # Chromium-based browser node. Bumped from 1Gi -> 2Gi (req 512Mi
+        # -> 1Gi) on 2026-05-25 — Edge had 51 OOMKills in 5d on the
+        # original 1Gi cap (~1 OOM every 2.4h), and Chrome at maxSessions=2
+        # was running 684Mi idle on the same cap. Matches the Firefox node's
+        # tested-stable 2Gi limit. CPU unchanged.
+        resources:
+          limits:
+            cpu: '1'
+            memory: 2Gi
+          requests:
+            cpu: 500m
+            memory: 1Gi
+        volumeMounts:
+        - mountPath: /dev/shm
+          name: dshm
+      - env:
+        - name: DISPLAY_CONTAINER_NAME
+          value: localhost
+        - name: SE_SCREEN_WIDTH
+          value: '1920'
+        - name: SE_SCREEN_HEIGHT
+          value: '1080'
+        - name: SE_VIDEO_FILE_NAME
+          value: auto
+        - name: SE_VIDEO_UPLOAD_ENABLED
+          value: 'false'
+        image: selenium/video:ffmpeg-7.1-20250101
+        name: video
+        resources:
+          limits:
+            cpu: 500m
+            memory: 768Mi
+          requests:
+            cpu: 250m
+            memory: 384Mi
+        volumeMounts:
+        - mountPath: /videos
+          name: selenium-videos
+      volumes:
+      - emptyDir:
+          medium: Memory
+          sizeLimit: 2Gi
+        name: dshm
+      - emptyDir:
+          sizeLimit: 5Gi
+        name: selenium-videos
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: selenium-node-firefox
+    app.kubernetes.io/name: selenium-node-firefox
+    app.kubernetes.io/part-of: selenium-grid
+  name: selenium-node-firefox
+  namespace: selenium
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: selenium-node-firefox
+  template:
+    metadata:
+      labels:
+        app: selenium-node-firefox
+        app.kubernetes.io/name: selenium-node-firefox
+        app.kubernetes.io/part-of: selenium-grid
+    spec:
+      containers:
+      - env:
+        - name: SE_EVENT_BUS_HOST
+          value: selenium-hub
+        - name: SE_EVENT_BUS_PUBLISH_PORT
+          value: '4442'
+        - name: SE_EVENT_BUS_SUBSCRIBE_PORT
+          value: '4443'
+        - name: SE_NODE_MAX_SESSIONS
+          value: '1'
+        - name: SE_NODE_OVERRIDE_MAX_SESSIONS
+          value: 'true'
+        - name: SE_VNC_NO_PASSWORD
+          value: '1'
+        - name: SE_START_VNC
+          value: 'false'
+        - name: SE_SCREEN_WIDTH
+          value: '1920'
+        - name: SE_SCREEN_HEIGHT
+          value: '1080'
+        - name: SE_NODE_SESSION_TIMEOUT
+          value: '300'
+        image: selenium/node-firefox:4.27.0
+        livenessProbe:
+          failureThreshold: 5
+          httpGet:
+            path: /status
+            port: 5555
+          initialDelaySeconds: 30
+          periodSeconds: 15
+          timeoutSeconds: 5
+        name: selenium-firefox
+        ports:
+        - containerPort: 5555
+          name: node
+        readinessProbe:
+          failureThreshold: 5
+          httpGet:
+            path: /status
+            port: 5555
+          initialDelaySeconds: 15
+          periodSeconds: 5
+          timeoutSeconds: 5
+        resources:
+          limits:
+            cpu: '1'
+            memory: 2Gi
+          requests:
+            cpu: 500m
+            memory: 1Gi
+        volumeMounts:
+        - mountPath: /dev/shm
+          name: dshm
+      volumes:
+      - emptyDir:
+          medium: Memory
+          sizeLimit: 2Gi
+        name: dshm
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: selenium-node-edge
+    app.kubernetes.io/name: selenium-node-edge
+    app.kubernetes.io/part-of: selenium-grid
+  name: selenium-node-edge
+  namespace: selenium
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: selenium-node-edge
+  template:
+    metadata:
+      labels:
+        app: selenium-node-edge
+        app.kubernetes.io/name: selenium-node-edge
+        app.kubernetes.io/part-of: selenium-grid
+    spec:
+      containers:
+      - env:
+        - name: SE_EVENT_BUS_HOST
+          value: selenium-hub
+        - name: SE_EVENT_BUS_PUBLISH_PORT
+          value: '4442'
+        - name: SE_EVENT_BUS_SUBSCRIBE_PORT
+          value: '4443'
+        - name: SE_NODE_MAX_SESSIONS
+          value: '1'
+        - name: SE_NODE_OVERRIDE_MAX_SESSIONS
+          value: 'true'
+        - name: SE_VNC_NO_PASSWORD
+          value: '1'
+        - name: SE_SCREEN_WIDTH
+          value: '1920'
+        - name: SE_SCREEN_HEIGHT
+          value: '1080'
+        - name: SE_NODE_SESSION_TIMEOUT
+          value: '300'
+        image: selenium/node-edge:4.27.0
+        livenessProbe:
+          httpGet:
+            path: /status
+            port: 5555
+          initialDelaySeconds: 30
+          periodSeconds: 15
+        name: selenium-edge
+        ports:
+        - containerPort: 5555
+          name: node
+        readinessProbe:
+          httpGet:
+            path: /status
+            port: 5555
+          initialDelaySeconds: 15
+          periodSeconds: 5
+        # Chromium-based browser node. Bumped from 1Gi -> 2Gi (req 512Mi
+        # -> 1Gi) on 2026-05-25 — Edge had 51 OOMKills in 5d on the
+        # original 1Gi cap (~1 OOM every 2.4h), and Chrome at maxSessions=2
+        # was running 684Mi idle on the same cap. Matches the Firefox node's
+        # tested-stable 2Gi limit. CPU unchanged.
+        resources:
+          limits:
+            cpu: '1'
+            memory: 2Gi
+          requests:
+            cpu: 500m
+            memory: 1Gi
+        volumeMounts:
+        - mountPath: /dev/shm
+          name: dshm
+      volumes:
+      - emptyDir:
+          medium: Memory
+          sizeLimit: 2Gi
+        name: dshm
+---
+apiVersion: traefik.io/v1alpha1
+kind: IngressRoute
+metadata:
+  name: selenium-hub
+  namespace: selenium
+spec:
+  entryPoints:
+  - websecure
+  routes:
+  - kind: Rule
+    match: Host(`selenium.iamworkin.lan`)
+    services:
+    - name: selenium-hub
+      port: 4444
+  tls:
+    secretName: selenium-tls

tests/bluejay-infra-lint/FleetManifestLintTests.cs

@@ -67,6 +67,7 @@ public sealed class FleetManifestLintTests
         ["github-runner-chat"] = "https://github.com/astoltz/FlowerCore.Chat",
         ["github-runner-mysql"] = "https://github.com/astoltz/FlowerCore.MySQL",
         ["github-runner-kiosk-linux"] = "https://github.com/astoltz/FlowerCore.Kiosk.Linux",
+        ["github-runner-updater"] = "https://github.com/astoltz/FlowerCore.Updater",
     };
 
     private static readonly HashSet<string> ScaledLinuxRunnerDeployments = new(StringComparer.Ordinal)
@@ -80,6 +81,7 @@ public sealed class FleetManifestLintTests
         "github-runner-chat",
         "github-runner-mysql",
         "github-runner-kiosk-linux",
+        "github-runner-updater",
     };
 
     private static readonly IReadOnlyDictionary<string, string> WritableRunnerEnv = new Dictionary<string, string>(StringComparer.Ordinal)
@@ -234,7 +236,7 @@ public sealed class FleetManifestLintTests
         {
             deployments.Should().ContainKey(expectedRunner.Key);
 
-            var container = deployments[expectedRunner.Key].ContainerMappings().Should().ContainSingle().Subject;
+            var container = deployments[expectedRunner.Key].MainContainerMappings().Should().ContainSingle().Subject;
             EnvValue(container, "REPO_URL").Should().Be(expectedRunner.Value);
             EnvValue(container, "EPHEMERAL").Should().Be("true");
             EnvValue(container, "LABELS").Should().Be("self-hosted,linux,fc-build-linux");
@@ -250,7 +252,7 @@ public sealed class FleetManifestLintTests
     {
         foreach (var deployment in GitHubRunnerDeployments().Values)
         {
-            var container = deployment.ContainerMappings().Should().ContainSingle().Subject;
+            var container = deployment.MainContainerMappings().Should().ContainSingle().Subject;
 
             foreach (var expectedEnv in WritableRunnerEnv)
             {
@@ -277,7 +279,10 @@ public sealed class FleetManifestLintTests
         foreach (var deploymentName in ScaledLinuxRunnerDeployments)
         {
             var deployment = deployments[deploymentName];
-            ReplicaCount(deployment).Should().Be(2);
+            // Scaled runners must have >= 2 replicas (avoid single-pod bottleneck).
+            // Individual deployments may be tuned upward per CI activity — see
+            // "runners: right-size replica counts per 14d CI activity (#24)".
+            ReplicaCount(deployment).Should().BeGreaterOrEqualTo(2, $"{deploymentName} is in the scaled set and must run with at least 2 replicas");
 
             var volumes = deployment.MappingSequence("spec", "template", "spec", "volumes");
             var claimNames = volumes
@@ -303,6 +308,108 @@ public sealed class FleetManifestLintTests
             .Be("github-runner-nuget-cache");
     }
 
+    [Fact]
+    public void Runners_MustNotPinToOperatorWorkstationHosts()
+    {
+        // CRITICAL SAFETY (operator directive 2026-05-26): BLUEJAY-WS is the
+        // operator's primary workstation — host of the 1Password Connect
+        // bearer token, fcadmin SSH keys to noc1, signing CA private keys,
+        // and source for every FC repo. A self-hosted GitHub Actions runner
+        // there would execute arbitrary PR code with that local access.
+        // Build-side analog of the Sprint 9 NEW safe-account exclusion gate
+        // (Puppet GPO/AppLocker/WDAC/audit-forwarder modules refuse to apply
+        // on BLUEJAY-WS). This lint asserts no GitHub-runner Deployment in
+        // apps/github-runner/ pins to a forbidden operator-workstation host
+        // via nodeName, nodeSelector, nodeAffinity, or tolerations.
+        // Existing legacy `bluejay-ws-sandbox-1` GitHub-registered runner is
+        // out of scope here (it's a runtime registration, not a K8s
+        // Deployment) — see CLAUDE.md "Common Mistakes" entry and
+        // feedback_bluejay_ws_never_public_runner.md.
+        var forbiddenHostPatterns = new[]
+        {
+            "bluejay-ws",
+            "BLUEJAY-WS",
+            "bluejay-ws.iamworkin.lan",
+            "iamworkin-ws",
+        };
+
+        bool ContainsForbidden(string? value) =>
+            !string.IsNullOrWhiteSpace(value)
+            && forbiddenHostPatterns.Any(pattern => value!.Contains(pattern, StringComparison.OrdinalIgnoreCase));
+
+        var violations = GitHubRunnerDeployments().Values.SelectMany(deployment =>
+        {
+            var local = new List<string>();
+            var podSpec = ManifestNodeExtensions.Mapping(deployment.Root, "spec", "template", "spec");
+            if (podSpec is null)
+            {
+                return local;
+            }
+
+            // nodeName: pins the pod to a specific node by name.
+            var nodeName = ManifestNodeExtensions.Scalar(podSpec, "nodeName");
+            if (ContainsForbidden(nodeName))
+            {
+                local.Add($"{deployment.Name} sets nodeName='{nodeName}' which targets a forbidden operator-workstation host.");
+            }
+
+            // nodeSelector: dict of label → value pinning the pod to nodes
+            // carrying matching labels. Examples that would trip this:
+            //   kubernetes.io/hostname: bluejay-ws
+            //   flowercore.io/host: bluejay-ws.iamworkin.lan
+            var nodeSelector = ManifestNodeExtensions.Mapping(podSpec, "nodeSelector");
+            if (nodeSelector is not null)
+            {
+                foreach (var entry in nodeSelector.Children)
+                {
+                    var key = entry.Key is YamlScalarNode keyScalar ? keyScalar.Value : null;
+                    var value = entry.Value is YamlScalarNode valueScalar ? valueScalar.Value : null;
+                    if (ContainsForbidden(value))
+                    {
+                        local.Add($"{deployment.Name} has nodeSelector entry '{key}: {value}' which targets a forbidden operator-workstation host.");
+                    }
+                }
+            }
+
+            // nodeAffinity: matchExpressions over node labels.
+            foreach (var term in ManifestNodeExtensions.MappingSequence(podSpec, "affinity", "nodeAffinity", "requiredDuringSchedulingIgnoredDuringExecution", "nodeSelectorTerms"))
+            {
+                foreach (var expr in ManifestNodeExtensions.MappingSequence(term, "matchExpressions"))
+                {
+                    var key = ManifestNodeExtensions.Scalar(expr, "key");
+                    foreach (var valueNode in ManifestNodeExtensions.ScalarSequence(expr, "values"))
+                    {
+                        if (ContainsForbidden(valueNode))
+                        {
+                            local.Add($"{deployment.Name} has nodeAffinity matchExpression '{key}' value '{valueNode}' which targets a forbidden operator-workstation host.");
+                        }
+                    }
+                }
+            }
+
+            // tolerations: scheduling onto a tainted operator-workstation
+            // node would let the runner run there. Forbid any toleration
+            // value that names the workstation.
+            foreach (var toleration in ManifestNodeExtensions.MappingSequence(podSpec, "tolerations"))
+            {
+                var key = ManifestNodeExtensions.Scalar(toleration, "key");
+                var value = ManifestNodeExtensions.Scalar(toleration, "value");
+                if (ContainsForbidden(key))
+                {
+                    local.Add($"{deployment.Name} has toleration key '{key}' which targets a forbidden operator-workstation host.");
+                }
+                if (ContainsForbidden(value))
+                {
+                    local.Add($"{deployment.Name} has toleration value '{value}' which targets a forbidden operator-workstation host.");
+                }
+            }
+
+            return local;
+        }).ToList();
+
+        violations.Should().BeEmpty("BLUEJAY-WS / iamworkin-ws must never host a fleet GitHub Actions runner; see CLAUDE.md 'Registering BLUEJAY-WS as a fleet GitHub Actions runner' and feedback_bluejay_ws_never_public_runner.md");
+    }
+
     [Fact]
     public void Monitoring_MustAlertWhenLinuxRunnerDeploymentIsUnavailable()
     {
@@ -890,6 +997,22 @@ internal sealed record ManifestDocument(
             .ToList();
     }
 
+    // MainContainerMappings excludes initContainers. Use this when asserting
+    // properties of the primary container (env, image, volumeMounts) where an
+    // initContainer would be a false-positive match — e.g. the GitHub runner
+    // image's `setup-runner-home` initContainer should not count toward the
+    // single-container assertions on the runner deployments.
+    public IReadOnlyList<YamlMappingNode> MainContainerMappings()
+    {
+        var podSpec = PodSpec();
+        if (podSpec is null)
+        {
+            return Array.Empty<YamlMappingNode>();
+        }
+
+        return ManifestNodeExtensions.MappingSequence(podSpec, "containers").ToList();
+    }
+
     public IReadOnlyList<ContainerSpec> ContainerSpecs()
     {
         return ContainerMappings()