# Quiet Scans Validation (Reachability + VEX + Dedup)

## Module
Scanner

## Status
VERIFIED

## Description
Reachability gates and VEX candidate emission are tested and integrated into the SmartDiff pipeline for quieter scan results.

## Implementation Details
- **Reachability Gate Bridge**:
  - `src/Scanner/__Libraries/StellaOps.Scanner.SmartDiff/Detection/ReachabilityGateBridge.cs` - `ReachabilityGateBridge` integrates reachability gate verdicts into the SmartDiff pipeline to suppress unreachable findings
- **VEX Candidate Emission**:
  - `src/Scanner/__Libraries/StellaOps.Scanner.SmartDiff/Detection/VexCandidateEmitter.cs` - `VexCandidateEmitter` generates VEX candidates for findings that can be auto-resolved
  - `src/Scanner/__Libraries/StellaOps.Scanner.SmartDiff/Detection/VexCandidateModels.cs` - Models for VEX candidate data
  - `src/Scanner/__Libraries/StellaOps.Scanner.SmartDiff/Detection/VexEvidence.cs` - VEX evidence supporting auto-resolution decisions
- **SmartDiff Pipeline**:
  - `src/Scanner/__Libraries/StellaOps.Scanner.SmartDiff/SmartDiffPredicate.cs` - `SmartDiffPredicate` applies reachability and VEX filters for quieter results
  - `src/Scanner/__Libraries/StellaOps.Scanner.SmartDiff/Detection/Repositories.cs` - Repository interfaces for SmartDiff detection data

## E2E Test Plan
- [ ] Scan an image with vulnerabilities in unreachable code paths and verify findings are suppressed by reachability gates
- [ ] Verify VEX candidate emission generates auto-resolution candidates for backported patches
- [ ] Verify the SmartDiff pipeline deduplicates findings that appear in both old and new scan results
- [ ] Verify the combination of reachability gates + VEX candidates + deduplication produces significantly fewer actionable findings
- [ ] Verify suppressed findings are still accessible with their suppression reason when queried explicitly

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## Verification

| Check | Result |
|-------|--------|
| Tier 0 - Source files exist | PASS |
| Tier 1 - Build + code review | PASS |
| Tier 2 - Integration tests | PASS |
| Verified | 2026-02-13T18:10:00Z |