chart: system-services-monitor subchart + parent registration

[dmvevents]

Per #891 split (4 of 5). Marked draft — depends on the implementation PR (#1382) landing first.

Series progress

• ✅ docs(design): ADR-030 — system-services-monitor scope #1380 ADR-030 design doc
• ✅ ci: register system-services-monitor in build/lint/publish matrices #1381 CI matrix wiring
• ✅ feat(monitor): system-services-monitor implementation + unit tests #1382 Implementation + tests (6/6 pytest pass)
• ✅ This PR (DRAFT until impl merges)
• ✅ demos: standalone system-services-monitor demo #1383 Demo (DRAFT)
• ✅ preflight: add cuda-validation init-container #1384 preflight cuda-validation init-container (follow-up)

What this contains

• distros/kubernetes/nvsentinel/charts/system-services-monitor/ Helm subchart (10 files: Chart.yaml, values.yaml, .helmignore, 7 templates including DaemonSet, ServiceMonitor, ClusterRole/Binding, ServiceAccount, Service, PrometheusRule, _helpers.tpl)
• distros/kubernetes/nvsentinel/Chart.yaml — subchart dependency registration
• distros/kubernetes/nvsentinel/values.yaml — defaults wiring

What this does NOT contain

• Implementation (feat(monitor): system-services-monitor implementation + unit tests #1382)
• CI wiring (ci: register system-services-monitor in build/lint/publish matrices #1381)
• Demo (demos: standalone system-services-monitor demo #1383)

Notes

The subchart's .Values.global.* references (e.g. imagePullSecrets, metricsPort) are supplied by the parent chart at deploy time. Standalone helm lint reports nil-pointer errors on these — that's expected and matches the same pattern in the merged sibling subchart (nic-health-monitor/templates/daemonset.yaml). Validated via helm template against the parent chart context.

cc @XRFXLP

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[github-actions]

@dmvevents this PR has been inactive for 14 days. Do you need help finishing it, or should we close it for now? Feel free to reopen anytime.

[github-actions]

@dmvevents this PR now has merge conflicts with main. Please rebase to resolve them.