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+# Sprint Completion Summary - 2026-01-02
+
+## Archived Sprints
+
+This directory contains completed sprints that were finalized on 2026-01-02.
+
+---
+
+## 1. SPRINT_20251230_001_BE - Tiered Evidence Backport Resolver
+
+**Status:** ✅ COMPLETE (All 38 tasks)
+
+### Overview
+Enhanced the backport patch resolver with proper version comparison semantics, derivative distro mapping, bug ID extraction, and 5-tier evidence hierarchy.
+
+### Key Deliverables
+- **Phase 1 - Version Comparator Integration (5 tasks)**
+  - Created `IVersionComparatorFactory` interface
+  - Wired RPM/Deb/APK comparators into `BackportStatusService`
+  - Updated `EvaluateBoundaryRules` with proof lines and audit trails
+
+- **Phase 2 - RangeRule Implementation (5 tasks)**
+  - Implemented `EvaluateRangeRules` with proper version semantics
+  - Added inclusive/exclusive boundary handling
+  - Low confidence designation for NVD-sourced ranges (Tier 5)
+
+- **Phase 3 - Derivative Distro Mapping (7 tasks)**
+  - Created `StellaOps.DistroIntel` library
+  - RHEL ↔ Alma/Rocky/CentOS mappings (Major releases 7-10)
+  - Ubuntu ↔ LinuxMint/Pop!_OS mappings
+  - Debian ↔ Ubuntu mappings
+  - Confidence penalties: 0.95x (High) / 0.80x (Medium)
+
+- **Phase 4 - Bug ID → CVE Mapping (9 tasks)**
+  - Debian bug regex extraction (`Closes: #123456`)
+  - RHBZ bug regex extraction (`RHBZ#123456`)
+  - Launchpad bug regex extraction (`LP: #123456`)
+  - Created `IBugCveMappingService` with `DebianSecurityTrackerClient` and `RedHatErrataClient`
+  - `BugCveMappingRouter` with 24h TTL caching
+
+- **Phase 5 - Affected Functions Extraction (8 tasks)**
+  - `FunctionSignatureExtractor` for C, Go, Python, Rust, Java, JavaScript
+  - Fuzzy function matching with Levenshtein similarity
+
+- **Phase 6 - Confidence Tier Alignment (5 tasks)**
+  - Expanded `RulePriority` enum to 9-level 5-tier hierarchy
+  - Updated `EvidencePointer` with `TierSource` and `EvidenceTier` enum
+
+### Files
+- `SPRINT_20251230_001_BE_backport_resolver_tiered_evidence.md` - Main tracker
+- `SPRINT_20251230_001_BE_backport_resolver_DESIGN.md` - Technical design doc
+- `SPRINT_20251230_001_BE_backport_resolver_TESTS.md` - Test specification
+
+### Test Coverage
+- 125 BackportProof tests passing
+- 34 TierPrecedenceTests
+- 47 FunctionSignatureExtractor tests
+- 58 FuzzyMatchingExtensions tests
+
+---
+
+## 2. SPRINT_20260102_001_BE - Binary Delta Signatures
+
+**Status:** ✅ COMPLETE (All 43 tasks)
+
+### Overview
+Implemented binary-level delta signature detection for identifying backported security patches across binaries without source code, enabling detection of security fixes that don't appear in changelogs or SBOMs.
+
+### Key Deliverables
+- **Phase 1 - Disassembly Abstractions (4 tasks)**
+  - Created `StellaOps.Disassembly.Abstractions` library
+  - Defined `IDisassemblyResult`, `IDisassembledFunction`, `IBasicBlock`, `IInstruction`
+
+- **Phase 2 - Disassembly Orchestration (6 tasks)**
+  - Created `StellaOps.Disassembly` orchestrator library
+  - Implemented `DisassemblyOrchestrator` with format routing
+  - Auto-detection for PE, ELF, Mach-O formats
+
+- **Phase 3 - B2R2 Backend (6 tasks)**
+  - Created `StellaOps.Disassembly.B2R2` for ELF/Mach-O
+  - Implemented `B2R2DisassemblerFactory` and `B2R2Disassembler`
+  - Symbol resolution and function boundary detection
+
+- **Phase 4 - Iced Backend (5 tasks)**
+  - Created `StellaOps.Disassembly.Iced` for PE/x86
+  - Implemented `IcedDisassemblerFactory` and `IcedDisassembler`
+
+- **Phase 5 - Normalization (6 tasks)**
+  - Created `StellaOps.Normalization` library
+  - Implemented register, constant, and jump target normalization
+  - `CanonicalInstructionBuilder` for deterministic output
+
+- **Phase 6 - Delta Signature Generation (8 tasks)**
+  - Created `StellaOps.DeltaSig` library
+  - `DeltaSignatureGenerator` for computing function-level delta hashes
+  - `SymbolHasher` for symbol-based lookup
+  - PostgreSQL storage integration
+
+- **Phase 7 - Scanner Integration (4 tasks)**
+  - Added `DeltaSignature` to `MatchMethod` enum
+  - Extended `IBinaryVulnerabilityService` with delta sig lookup
+  - Created `DeltaSigAnalyzer` in Scanner.Worker
+
+- **Phase 8 - VEX Evidence Emission (4 tasks)**
+  - Created `DeltaSignatureEvidence` model
+  - Created `DeltaSigVexEmitter` service
+  - Extended `EvidenceBundle` with DeltaSignature field
+
+### Created Libraries
+1. `StellaOps.Disassembly.Abstractions` - Core abstractions
+2. `StellaOps.Disassembly` - Orchestration layer
+3. `StellaOps.Disassembly.B2R2` - F# backend for ELF/Mach-O
+4. `StellaOps.Disassembly.Iced` - C# backend for PE
+5. `StellaOps.Normalization` - Instruction normalization
+6. `StellaOps.DeltaSig` - Delta signature generation
+
+### Test Coverage
+- 74 DeltaSig tests passing
+- 25 DeltaSigVexEmitter tests
+- All BinaryIndex solution tests passing
+
+### Documentation
+- 7 AGENTS.md files for BinaryIndex libraries
+- ADR 0044: Binary Delta Signatures for Backport Detection
+
+---
+
+## Impact Summary
+
+These two sprints together deliver a comprehensive backport detection system:
+
+1. **Version-aware analysis** - Proper handling of RPM, Debian, and Alpine version semantics
+2. **Multi-distro support** - Cross-distro evidence sharing via derivative mappings
+3. **Bug tracking integration** - Debian/RHBZ/LP bug ID to CVE resolution
+4. **Binary-level detection** - Delta signature matching for compiled code
+5. **5-tier evidence hierarchy** - Structured confidence scoring with audit trails
+
+Total tasks completed: **81 tasks**
+Total tests added: **300+ tests**