feat: Implement Phase 3 automation for K8s agent system

Automation components for scheduled and event-driven workflows:

Scheduler:
- scheduler.sh for cron-based workflow execution
- Logs workflow runs to ~/.claude/logs/workflows/
- Notifies dashboard on completion

Alertmanager Integration:
- webhook-receiver.sh for processing alerts
- Dashboard endpoint /api/webhooks/alertmanager
- Example alertmanager-config.yaml with routing rules
- Maps alerts to workflows (crashloop, node issues, resources)

New Incident Workflows:
- node-issue-response.yaml: Handle NotReady/unreachable nodes
- resource-pressure-response.yaml: Respond to memory/CPU overcommit
- argocd-sync-failure.yaml: Investigate and fix sync failures

Dashboard Updates:
- POST /api/webhooks/alertmanager endpoint
- POST /api/workflows/{name}/complete endpoint
- Alerts create pending actions for visibility

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

automation/alertmanager-config.yaml

@@ -0,0 +1,55 @@
+# Alertmanager Configuration Example
+# Add this webhook receiver to send alerts to the K8s agent system
+#
+# This is an EXAMPLE - merge with your existing alertmanager config
+
+global:
+  resolve_timeout: 5m
+
+route:
+  receiver: 'default'
+  group_by: ['alertname', 'namespace']
+  group_wait: 30s
+  group_interval: 5m
+  repeat_interval: 4h
+
+  routes:
+    # Route pod-related alerts to the agent
+    - match_re:
+        alertname: ^(KubePodCrashLooping|KubePodNotReady|KubeContainerWaiting)$
+      receiver: 'k8s-agent'
+      continue: true
+
+    # Route node-related alerts to the agent
+    - match_re:
+        alertname: ^(KubeNodeNotReady|KubeNodeUnreachable|NodeMemoryHighUsage)$
+      receiver: 'k8s-agent'
+      continue: true
+
+    # Route resource alerts to the agent
+    - match_re:
+        alertname: ^(KubeMemoryOvercommit|KubeCPUOvercommit|KubePersistentVolumeFillingUp)$
+      receiver: 'k8s-agent'
+      continue: true
+
+receivers:
+  - name: 'default'
+    # Your default receiver (email, slack, etc.)
+
+  - name: 'k8s-agent'
+    webhook_configs:
+      # Option 1: Dashboard webhook endpoint
+      - url: 'http://k8s-agent-dashboard.k8s-agent.svc.cluster.local/api/webhooks/alertmanager'
+        send_resolved: true
+
+      # Option 2: External webhook receiver (if dashboard not available)
+      # - url: 'http://your-webhook-host:9000/alerts'
+      #   send_resolved: true
+
+# Inhibit rules - prevent duplicate alerts
+inhibit_rules:
+  - source_match:
+      severity: 'critical'
+    target_match:
+      severity: 'warning'
+    equal: ['alertname', 'namespace']