semi implemented and features implemented save checkpoint

docs/features/unchecked/binaryindex/binary-call-graph-extraction-and-reachability-analysis.md

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+# Binary Call-Graph Extraction and Reachability Analysis
+
+## Module
+BinaryIndex
+
+## Status
+IMPLEMENTED
+
+## Description
+Binary call-graph extraction with BinaryCallGraphExtractor, reachability lifting via BinaryReachabilityLifter, dedicated BinaryIndex analysis module, and CLI binary commands.
+
+## Implementation Details
+- **Modules**: `src/BinaryIndex/__Libraries/StellaOps.BinaryIndex.Analysis/`, `src/BinaryIndex/__Libraries/StellaOps.BinaryIndex.Semantic/`, `src/BinaryIndex/__Libraries/StellaOps.BinaryIndex.DeltaSig/`
+- **Key Classes**:
+  - `ReachGraphBinaryReachabilityService` (`src/BinaryIndex/__Libraries/StellaOps.BinaryIndex.Analysis/ReachGraphBinaryReachabilityService.cs`) - binary-level reachability integration with ReachGraph
+  - `TaintGateExtractor` (`src/BinaryIndex/__Libraries/StellaOps.BinaryIndex.Analysis/TaintGateExtractor.cs`) - extracts taint gates (bounds checks, null checks, auth checks, permission checks, type checks) from binary call paths
+  - `CfgExtractor` (`src/BinaryIndex/__Libraries/StellaOps.BinaryIndex.DeltaSig/CfgExtractor.cs`) - control flow graph extraction from disassembled binaries
+  - `CallNgramGenerator` (`src/BinaryIndex/__Libraries/StellaOps.BinaryIndex.Semantic/CallNgramGenerator.cs`) - generates call-sequence n-grams from lifted IR for call graph analysis
+  - `CallGraphMatcherAdapter` (`src/BinaryIndex/__Libraries/StellaOps.BinaryIndex.Validation/Matchers/MatcherAdapters.cs`) - adapter for call graph matching in validation harness
+- **Interfaces**: `ICallNgramGenerator`, `IBinaryFeatureExtractor`
+
+## E2E Test Plan
+- [ ] Submit an ELF binary and verify call-graph extraction produces a valid set of function nodes and edges
+- [ ] Verify `TaintGateExtractor` classifies conditions correctly (bounds check, null check, auth check, permission check, type check)
+- [ ] Verify `CfgExtractor` produces control flow graphs from disassembled functions
+- [ ] Verify `CallNgramGenerator` generates n-grams (n=2,3,4) from lifted function IR and computes Jaccard similarity
+- [ ] Verify `ReachGraphBinaryReachabilityService` integrates with the ReachGraph module for function-level exploitability assessment
+- [ ] Verify call-graph-based reachability results feed into the ensemble decision engine