Excititor VEX escalation service

Module

Excititor

IMPLEMENTED

Excititor module with auto-VEX justification, calibration comparison engine, CycloneDX export, and export engine with test coverage.

Modules: src/Excititor/__Libraries/StellaOps.Excititor.Core/, src/Excititor/__Libraries/StellaOps.Excititor.Export/
Key Classes:
- AutoVexDowngradeService (src/Excititor/__Libraries/StellaOps.Excititor.Core/AutoVex/AutoVexDowngradeService.cs) - orchestrates auto-VEX downgrade and escalation
- CalibrationComparisonEngine (src/Excititor/__Libraries/StellaOps.Excititor.Core/Calibration/CalibrationComparisonEngine.cs) - compares calibration results for post-mortem analysis
- DriftGateIntegration (src/Excititor/__Libraries/StellaOps.Excititor.Core/AutoVex/DriftGateIntegration.cs) - integrates drift detection with VEX escalation
- ExportEngine (src/Excititor/__Libraries/StellaOps.Excititor.Export/ExportEngine.cs) - multi-format VEX export engine (OpenVEX, CycloneDX, CSAF)
- VexConsensusResolver (src/Excititor/__Libraries/StellaOps.Excititor.Core/VexConsensusResolver.cs) - resolves consensus across multiple VEX sources
- VexConsensusRefreshService (src/Excititor/StellaOps.Excititor.Worker/Scheduling/VexConsensusRefreshService.cs) - scheduled refresh of VEX consensus
Interfaces: IVexConsensusPolicy, IVexExportStore
Source: Feature matrix scan

Trigger a VEX escalation when conflicting claims are detected and verify AutoVexDowngradeService produces the correct escalated status
Verify CalibrationComparisonEngine compares pre/post calibration snapshots and reports differences
Verify DriftGateIntegration escalates VEX status when drift is detected in container images
Export VEX data via ExportEngine in CycloneDX format and verify schema compliance
Verify VexConsensusResolver resolves multi-source conflicts deterministically
Verify VexConsensusRefreshService periodically refreshes consensus and detects status changes