Add production-grade Helm chart improvements

High-impact improvements based on Codex recommendations:

1. values.schema.json - JSON schema validation catches config errors at install time
2. helm-docs automation - Auto-generates documentation from values.yaml comments
3. kind smoke tests - Deploys and upgrades chart in real cluster to catch runtime issues
4. ServiceMonitor template - Built-in Prometheus integration for observability
5. Artifact Hub metadata - Changelog, links, and maintainer info for better discoverability

These improvements provide:
- Configuration validation before deployment
- Always up-to-date documentation
- Runtime validation in CI
- First-class monitoring support
- Better user experience on Artifact Hub

Related to #686

deploy/helm/pulse/values.yaml

@@ -138,3 +138,14 @@ agent:
     hostPathType: Socket
   extraVolumes: []
   extraVolumeMounts: []
+
+# Monitoring configuration
+monitoring:
+  serviceMonitor:
+    enabled: false
+    interval: 30s
+    scrapeTimeout: 10s
+    path: /metrics
+    labels: {}
+    relabelings: []
+    metricRelabelings: []