# Delta Verdict Engine

## Module
Policy

## Status
VERIFIED

## Verification Summary
Full delta verdict computation verified across 3 test projects (2059 tests total, 0 failures):
- **WhatIfSimulationService**: hypothetical SBOM diffs (add/remove/upgrade/downgrade) with VEX override and reachability downgrade
- **DeltaVerdictBuilder**: content-addressed VerdictId, gate escalation (Critical->G4, High->G3), PassWithExceptions
- **ConsoleSimulationDiffService**: deterministic delta diff with severity breakdowns, rule impact, explain samples
- **SimulationAnalyticsService**: delta summary with outcome/severity change tracking, high-impact findings, determinism hashes
- **EffectiveDecisionMap**: materialized baseline decisions for delta comparison
- **PolicyEngineDeterminismTests**: same inputs produce identical verdict hashes, order-independent, concurrent-safe

## Evidence
- `docs/qa/feature-checks/runs/policy/delta-verdict-engine/run-002/`