# Sprint Completion Summary - 2026-01-02

## Archived Sprints

This directory contains completed sprints that were finalized on 2026-01-02.

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## 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

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## 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

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## 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**