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docs/features/checked/vexlens/deterministic-vex-resolver-with-lattice-merge.md

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+# Deterministic VEX Resolver with Lattice Merge
+
+## Module
+VexLens
+
+## Status
+IMPLEMENTED
+
+## Description
+Full VEX consensus engine with lattice merge semantics, trust weight computation, and conflict resolution. Supports deterministic, commutative, idempotent, and associative merge operations.
+
+## Implementation Details
+- **Consensus engine**: `src/VexLens/StellaOps.VexLens/Consensus/VexConsensusEngine.cs`, `IVexConsensusEngine.cs` -- lattice merge with deterministic, commutative, idempotent, and associative merge operations
+- **Core consensus engine**: `src/VexLens/StellaOps.VexLens/StellaOps.VexLens.Core/Consensus/VexConsensusEngine.cs`, `IVexConsensusEngine.cs` -- core consensus logic
+- **Normalizers**: `src/VexLens/StellaOps.VexLens/Normalization/CsafVexNormalizer.cs`, `CycloneDxVexNormalizer.cs`, `OpenVexNormalizer.cs`, `IVexNormalizer.cs` -- normalize CSAF, CycloneDX, and OpenVEX into unified VEX model
+- **Core normalizer**: `src/VexLens/StellaOps.VexLens/StellaOps.VexLens.Core/Normalization/VexLensNormalizer.cs`, `IVexLensNormalizer.cs`
+- **Product mapping**: `src/VexLens/StellaOps.VexLens/Mapping/ProductMapper.cs`, `ProductIdentityMatcher.cs`, `CpeParser.cs`, `PurlParser.cs` -- product identity resolution for merge
+- **Propagation engine**: `src/VexLens/StellaOps.VexLens/Propagation/PropagationRuleEngine.cs`, `IPropagationRuleEngine.cs` -- VEX statement propagation rules
+- **Condition evaluator**: `src/VexLens/StellaOps.VexLens/Conditions/ConditionEvaluator.cs`, `IConditionEvaluator.cs` -- conditional merge evaluation
+- **Proof builder**: `src/VexLens/StellaOps.VexLens/Proof/VexProofBuilder.cs`, `VexProof.cs`, `VexProofSerializer.cs` -- deterministic proof generation for merge decisions
+- **Normalized models**: `src/VexLens/StellaOps.VexLens/Models/NormalizedVexModels.cs` -- unified VEX document model
+- **Tests**: `src/VexLens/StellaOps.VexLens/__Tests/StellaOps.VexLens.Tests/E2E/VexLensPipelineDeterminismTests.cs`, `Proof/VexProofShuffleDeterminismTests.cs`, `Propagation/PropagationRuleEngineTests.cs`, `Regression/VexLensRegressionTests.cs`
+- **Golden corpus**: `src/VexLens/StellaOps.VexLens/__Tests/StellaOps.VexLens.Tests/GoldenCorpus/` -- deterministic corpus tests
+- **Source**: Feature matrix scan
+
+## E2E Test Plan
+- [ ] Verify lattice merge produces deterministic results regardless of input order
+- [ ] Test commutativity: merge(A,B) equals merge(B,A)
+- [ ] Test idempotency: merge(A,A) equals A
+- [ ] Test associativity: merge(merge(A,B),C) equals merge(A,merge(B,C))
+- [ ] Verify conflict resolution produces consistent outcomes
+- [ ] Run golden corpus determinism tests