rebrand: Switchboard Core → Armature

- Rename Go module switchboard-core → armature (155+ files)
- Rename Docker image → gobha/armature
- Rename K8s resources, secrets, deployments
- Rename Prometheus metrics switchboard_* → armature_*
- Rename env vars SWITCHBOARD_ADMIN_* → ARMATURE_ADMIN_*
- Rename DB names switchboard_core* → armature*
- Update all frontend branding, notification templates, docs
- Update CI scripts, e2e tests, Keycloak realm, nginx conf
- Rename scripts/switchboard-ca.sh → scripts/armature-ca.sh
- Rename k8s/switchboard.yaml → k8s/armature.yaml
- Rename chart alerting/dashboard files
- Fix: DockerHub push uses env: binding for secret injection
- Helm chart updated (name, labels, template functions, dashboard, alerting)
- Replace favicon/icon assets with Armature brand

No functional changes. Pure mechanical rename + CI fix.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

chart/alerting/armature-rules.yaml

@@ -0,0 +1,69 @@
+# Armature Core — PrometheusRule alerts (v0.33.0)
+# Source file for the Helm template. Deploy via:
+#   monitoring.prometheusRule.enabled: true
+apiVersion: monitoring.coreos.com/v1
+kind: PrometheusRule
+metadata:
+  name: armature-alerts
+spec:
+  groups:
+    - name: armature.rules
+      rules:
+        # Pod restart (possible OOM)
+        - alert: ArmaturePodRestart
+          expr: increase(kube_pod_container_status_restarts_total{container="backend"}[1h]) > 0
+          for: 0m
+          labels:
+            severity: warning
+          annotations:
+            summary: "Armature backend pod restarted (possible OOM)"
+            description: "Container {{ $labels.container }} in pod {{ $labels.pod }} restarted."
+
+        # Provider down for 5+ minutes
+        - alert: ArmatureProviderDown
+          expr: armature_provider_status > 2
+          for: 5m
+          labels:
+            severity: critical
+          annotations:
+            summary: "Provider {{ $labels.provider_config_id }} is down"
+
+        # DB pool >80% utilized
+        - alert: ArmatureDBPoolExhaustion
+          expr: armature_db_in_use_connections / armature_db_open_connections > 0.8
+          for: 5m
+          labels:
+            severity: warning
+          annotations:
+            summary: "DB connection pool >80% utilized"
+
+        # HTTP 5xx error rate >5%
+        - alert: ArmatureHighErrorRate
+          expr: >
+            sum(rate(armature_http_requests_total{status=~"5.."}[5m]))
+            / sum(rate(armature_http_requests_total[5m])) > 0.05
+          for: 5m
+          labels:
+            severity: warning
+          annotations:
+            summary: "HTTP 5xx error rate exceeds 5%"
+
+        # Task failure rate >25%
+        - alert: ArmatureTaskFailureRate
+          expr: >
+            rate(armature_task_executions_total{status="error"}[15m])
+            / rate(armature_task_executions_total[15m]) > 0.25
+          for: 10m
+          labels:
+            severity: warning
+          annotations:
+            summary: "Task failure rate exceeds 25% over 15 minutes"
+
+        # No completions processed in 15 minutes (canary)
+        - alert: ArmatureNoCompletions
+          expr: sum(rate(armature_completions_total[10m])) == 0
+          for: 15m
+          labels:
+            severity: critical
+          annotations:
+            summary: "No completions processed in 15 minutes"