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docs: Grafana dashboard, alert rules, and OTel Collector example

Adds Grafana-side observability for the operator's OTLP metrics:

- docs/grafana/netchecks-dashboard.json — single dashboard with 11
  panels: reconcile throughput/errors, reconcile duration p50/p95/p99,
  in-flight reconciliations, assertion processing rate, PolicyReport
  upsert rate, probe duration by type, plus four headline stats.
- docs/grafana/alerts/netchecks-alerts.yaml — five Grafana unified-
  alerting rules (operator down, reconcile error rate, reconcile p95
  slow, probe p95 slow, no successful reconciles).
- operator/examples/observability/otel-collector.yaml — minimal OTel
  Collector deployment (otel/opentelemetry-collector-contrib:0.110.0)
  that receives OTLP from the operator and re-exposes /metrics on :8889.
- operator/examples/observability/servicemonitor.yaml — ServiceMonitor
  pointing Prometheus Operator at the collector's prometheus port.
- READMEs explaining the pipeline, import flow, metric catalog, and
  per-rule trigger scripts for local validation.

Validated locally on kind 1.32.2 with kube-prometheus-stack: dashboard
imports cleanly, alerts all evaluate ok (1 inactive, 1 pending due to
the fresh-install increase(...[30m]) edge case noted in the README),
Prometheus successfully scrapes the otel-collector at :8889/metrics
and surfaces all six operator metric families.

The operator code is unchanged — this is purely receiving-side
infrastructure and operator-agnostic queries. The operator still
exports OTLP only; for non-Prometheus consumers point them at the
OTel Collector or use grafana/otel-lgtm for local dev.

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Source Files on job Unittests-macos-latest- - 25754840455.3