Improve AI test coverage
- baseline/store_test.go: Add tests for CheckResourceAnomalies, formatAnomalyDescription, formatRatio, GetAllAnomalies, floatToStr (67.9% -> 92.2%)
- memory/incidents_test.go: Add tests for RecordAlertUnacknowledged, RecordRunbook, ListIncidentsByResource, FormatForAlert, FormatForResource, FormatForPatrol (66.8% -> 81.1%)
- intelligence_test.go: Add tests for SetStateProvider, FormatGlobalContext, RecordLearning, severityOrder, CheckBaselinesForResource with baselines (61.4% -> 63.1%)