semi implemented and features implemented save checkpoint

docs/features/unchecked/attestor/smart-diff-system.md

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+# Smart-Diff System (Semantic Security Delta, Binary Diff Predicates)
+
+## Module
+Attestor
+
+## Status
+IMPLEMENTED
+
+## Description
+Smart-diff computing semantic security deltas between SBOM versions with material risk change detection, reachability-aware gating, delta verdict generation, SARIF output, and CLI commands. Binary diff as signed predicates with schema validation, DSSE verification, normalization, and finding extraction.
+
+## Implementation Details
+- **SBOM Delta Predicate**: `src/Attestor/__Libraries/StellaOps.Attestor.ProofChain/Predicates/SbomDeltaPredicate.cs` -- SBOM-level semantic delta.
+- **SBOM Delta Component**: `Predicates/SbomDeltaComponent.cs` -- component-level change tracking.
+- **Delta Verdict Predicate**: `Predicates/DeltaVerdictPredicate.cs` (with `.Budget`) -- verdict delta with budget integration.
+- **Binary Diff Predicate Builder**: `__Libraries/StellaOps.Attestor.StandardPredicates/BinaryDiff/BinaryDiffPredicateBuilder.cs` (with `.Build`) -- builds binary diff predicates. `IBinaryDiffPredicateBuilder.cs` -- interface.
+- **Binary Diff Serializer**: `BinaryDiff/BinaryDiffPredicateSerializer.cs` (with `.Normalize`) -- serializes with normalization. `IBinaryDiffPredicateSerializer.cs` -- interface.
+- **Binary Diff Finding**: `BinaryDiff/BinaryDiffFinding.cs` -- individual finding from binary diff analysis.
+- **Binary Diff Section Models**: `BinaryDiff/BinaryDiffSectionModels.cs` -- section-level diff models.
+- **Binary Diff Schema**: `BinaryDiff/BinaryDiffSchema.SchemaJson.cs` -- embedded JSON schema. `BinaryDiffSchemaValidationResult.cs` -- validation result.
+- **Binary Diff DSSE Verifier**: `BinaryDiff/BinaryDiffDsseVerifier.cs` (with `.Helpers`) -- DSSE verification. `IBinaryDiffDsseVerifier.cs` -- interface.
+- **Change Trace**: `__Libraries/StellaOps.Attestor.ProofChain/ChangeTrace/ChangeTraceAttestationService.cs` -- change trace attestations for smart-diff events.
+- **Tests**: `__Tests/StellaOps.Attestor.StandardPredicates.Tests/BinaryDiffTests.cs`, `__Tests/StellaOps.Attestor.ProofChain.Tests/SbomDeltaTests.cs`
+
+## E2E Test Plan
+- [ ] Compute a semantic SBOM delta between two versions and verify `SbomDeltaPredicate` captures added/removed/changed components
+- [ ] Build a binary diff predicate via `BinaryDiffPredicateBuilder` and verify findings are extracted
+- [ ] Validate the binary diff against `BinaryDiffSchema` and verify schema compliance
+- [ ] Sign the binary diff into a DSSE envelope and verify via `BinaryDiffDsseVerifier`
+- [ ] Normalize a binary diff via `BinaryDiffPredicateSerializer.Normalize` and verify deterministic output
+- [ ] Generate a delta verdict from the smart-diff and verify material risk changes are flagged
+- [ ] Create a change trace attestation for the smart-diff event and verify it links to before/after versions
+- [ ] Verify `BinaryDiffFinding` captures function name, offset, and change type for each diff finding