semi implemented and features implemented save checkpoint

docs/features/unchecked/attestor/binary-reachability-proofs-binary-diff-analysis.md

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+# Binary Reachability Proofs / Binary Diff Analysis
+
+## Module
+Attestor
+
+## Status
+IMPLEMENTED
+
+## Description
+Full binary diff analysis pipeline with schema validation, DSSE-verified predicates, normalization, and fingerprint evidence generation.
+
+## Implementation Details
+- **BinaryDiff Pipeline**: `src/Attestor/__Libraries/StellaOps.Attestor.StandardPredicates/BinaryDiff/` -- complete pipeline:
+  - `IBinaryDiffPredicateBuilder.cs` / `BinaryDiffPredicateBuilder.cs` (with `.Build`) -- constructs diff predicates
+  - `IBinaryDiffPredicateSerializer.cs` / `BinaryDiffPredicateSerializer.cs` (with `.Normalize`) -- deterministic serialization
+  - `IBinaryDiffDsseVerifier.cs` / `BinaryDiffDsseVerifier.cs` (with `.Helpers`) -- DSSE verification
+  - `BinaryDiffDsseSigner.cs` -- DSSE signing
+  - `BinaryDiffSchema.cs` (with `.SchemaJson`) -- JSON schema validation
+  - `BinaryDiffSectionModels.cs` -- section-level models (ELF/PE)
+  - `BinaryDiffFinding.cs` -- individual findings
+  - `BinaryDiffMetadataBuilder.cs` -- metadata construction
+- **Fingerprint Evidence**: `src/Attestor/__Libraries/StellaOps.Attestor.ProofChain/Generators/BinaryFingerprintEvidenceGenerator.cs` (with `.Helpers`) -- generates reachability-aware fingerprint evidence.
+- **Reachability Integration**: Binary diff evidence feeds into `ReachabilityWitnessPayload` (statements) and `BinaryMicroWitnessPredicate` (predicates) for reachability proof chains.
+- **Tests**: `__Tests/StellaOps.Attestor.StandardPredicates.Tests/BinaryDiff/` -- builder, serializer, signer, schema validation tests. `__Tests/StellaOps.Attestor.ProofChain.Tests/BinaryMicroWitnessPredicateTests.cs`
+
+## E2E Test Plan
+- [ ] Run the full binary diff pipeline: build predicate from findings, normalize/serialize, sign with DSSE, verify signature, validate against schema
+- [ ] Create diff findings for a patched vulnerability (binary changed in .text section) and verify the predicate captures the patch as a security-relevant change
+- [ ] Normalize the same diff predicate twice and verify byte-for-byte output equality
+- [ ] Validate a well-formed predicate against `BinaryDiffSchema` and verify it passes
+- [ ] Validate a predicate missing required fields and verify schema validation fails with specific error
+- [ ] Generate fingerprint evidence from a binary diff result and verify it links to the diff attestation
+- [ ] Feed binary diff evidence into a `BinaryMicroWitnessPredicate` and verify the reachability proof chain includes the diff evidence