semi implemented and features implemented save checkpoint

docs/features/unchecked/excititor/vex-delta-persistence-table.md

@@ -0,0 +1,40 @@
+# VEX Delta Persistence Table
+
+## Status
+IMPLEMENTED
+
+## Description
+Persistent tracking of VEX status transitions between artifact versions with rationale and replay hashes. Schema designed but not implemented.
+
+## Why Marked as Dropped (Correction)
+**FINDING: VEX delta persistence IS implemented across multiple modules.** The following exist:
+- `src/Excititor/__Libraries/StellaOps.Excititor.Persistence/Postgres/Repositories/PostgresVexDeltaRepository.cs` -- PostgreSQL VEX delta repository
+- `src/VexLens/StellaOps.VexLens/Services/VexDeltaComputeService.cs` -- VEX delta computation
+- `src/VexLens/StellaOps.VexLens/Mapping/VexDeltaMapper.cs` -- VEX delta data mapping
+- `src/VexLens/StellaOps.VexLens/Storage/InMemoryConsensusProjectionStore.cs` -- in-memory projection store
+- `src/VexLens/StellaOps.VexLens.Persistence/Repositories/ConsensusProjectionRepository.cs` -- persistent consensus projections
+- `src/VexLens/StellaOps.VexLens.Persistence/Postgres/VexLensDataSource.cs` -- PostgreSQL data source
+- `src/SbomService/__Libraries/StellaOps.SbomService.Lineage/Repositories/VexDeltaRepository.cs` -- SBOM lineage VEX delta tracking
+- `src/SbomService/__Libraries/StellaOps.SbomService.Lineage/Persistence/Migrations/00001_InitialSchema.sql` -- migration with VEX delta tables
+- Attestor proof chain predicates: `VexDeltaPredicate.cs`, `VexDeltaSummary.cs`, `VexDeltaChange.cs`, `VexDeltaStatement.cs`
+
+## Implementation Details
+- Excititor persistence: `src/Excititor/__Libraries/StellaOps.Excititor.Persistence/Postgres/Repositories/PostgresVexDeltaRepository.cs`
+- VexLens computation: `src/VexLens/StellaOps.VexLens/Services/VexDeltaComputeService.cs`
+- VexLens mapping: `src/VexLens/StellaOps.VexLens/Mapping/VexDeltaMapper.cs`
+- SbomService lineage: `src/SbomService/__Libraries/StellaOps.SbomService.Lineage/Repositories/VexDeltaRepository.cs`
+- Attestor predicates: `src/Attestor/__Libraries/StellaOps.Attestor.ProofChain/Predicates/VexDelta*.cs`
+
+## E2E Test Plan
+- Verify VEX delta computation tracks status transitions correctly
+- Test persistence and retrieval of VEX deltas
+- Validate consensus projection store maintains correct state
+- Test delta predicates are included in proof chain attestations
+
+## Source
+- Feature matrix scan
+
+## Notes
+- Module: Excititor
+- Modules referenced: `src/Excititor/`, `src/VexLens/`, `src/SbomService/`
+- **Status should be reclassified from NOT_FOUND to IMPLEMENTED**