P26: Pipeline Telemetry — OTel instrumentation, perf module, Grafana dashboards
Pipeline telemetry via OpenTelemetry. Added perf as 12th skinny package with traces→Jaeger, metrics→Prometheus, logs→Loki fan-out through OTel Collector. Includes psutil system metrics, MockTracer zero-cost no-ops, Grafana dashboard, auto-issue filing on pipeline/test/CI failures. 11 issues, 82 new tests. CI verified: run #103 all green, deploy #104 success.
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