feat(observability): production-grade metrics, alerting, synthetic canary & SLOs (#650)#665

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CelestinaBeing:feat/observability-reliability-650

Commits on Jun 20, 2026

feat(observability): production-grade metrics, alerting, canary & SLOs (#650)
CelestinaBeing
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fix(ci): resolve prettier, promtool parse error, and canary syntax failure
CelestinaBeing
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