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>

dashboard/cmd/server/main.go

@@ -55,6 +55,10 @@ func main() {
 		r.Get("/history", api.GetActionHistory(s))
 		r.Get("/workflows", api.GetWorkflows(s))
 		r.Post("/workflows/{name}/run", api.RunWorkflow(s))
+		r.Post("/workflows/{name}/complete", api.CompleteWorkflow(s))
+
+		// Webhook endpoints
+		r.Post("/webhooks/alertmanager", api.AlertmanagerWebhook(s))
 	})
 
 	// Static files