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ADR-023 captures why prometheus-fastapi-instrumentator was chosen, the build_metrics(registry) factory pattern, and the test rebinding seam. The glossary gains four ops-aligned terms — illegible word, models-ready gauge, recognition vs segmentation accuracy — so the metrics documentation in OBSERVABILITY.md has a vocabulary to lean on. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>