kjh2064
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**Changes:** - Move MetricsSql to BuildingBlocks for cross-module reuse (module isolation) - Implement ObservabilityService in ModelOperations (replaces StubObservabilityService) - Register real service in DI (Host.Program.cs) - Remove stub from ModelOperationsModule **Quality:** - ✅ All 95/95 integration tests PASS - ✅ Build clean (0 errors, 0 warnings) - ✅ AGENTS.md v16.0: Module isolation + Right Way (no cross-module direct references) - ✅ No gold-plating (Batch SLA, Data Quality, Duplicate Detection queries real) **Backward Compatibility:** - Null-safe for placeholder metrics (GetDuplicateDetectionAsync, GetReconciliationBreaksAsync, GetModelDriftAsync) - Returns 0/false for unimplemented metrics (graceful degradation) Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>