# Feature Flag Gate Conditions in Reachability Verdicts

## Module
Scanner

## Status
VERIFIED

## Description
Detects feature flag gates on reachability paths and marks paths as "conditionally reachable" with specific flag name/condition requirements. Gated paths receive 0.5x confidence multiplier.

## Implementation Details
- **Feature Flag Detector**:
  - `src/Scanner/__Libraries/StellaOps.Scanner.Reachability/Gates/Detectors/FeatureFlagDetector.cs` - Detects feature flag conditions on reachability paths
  - `src/Scanner/__Libraries/StellaOps.Scanner.Reachability/Gates/Detectors/IGateDetector.cs` - Gate detector interface
- **Gate Models & Scoring**:
  - `src/Scanner/__Libraries/StellaOps.Scanner.Reachability/Gates/GateModels.cs` - Gate models including feature flag conditions
  - `src/Scanner/__Libraries/StellaOps.Scanner.Reachability/Gates/GatePatterns.cs` - Pattern matching for feature flag detection
  - `src/Scanner/__Libraries/StellaOps.Scanner.Reachability/Gates/GateMultiplierCalculator.cs` - Applies 0.5x confidence multiplier for feature-flag-gated paths
- **Rich Graph Annotation**:
  - `src/Scanner/__Libraries/StellaOps.Scanner.Reachability/Gates/RichGraphGateAnnotator.cs` - Annotates rich graph with feature flag gate information
- **Conditional Reachability**:
  - `src/Scanner/__Libraries/StellaOps.Scanner.Reachability/Dependencies/ConditionalReachabilityAnalyzer.cs` - Marks paths as "conditionally reachable"

## E2E Test Plan
- [ ] Scan an image with code behind feature flags (e.g., `if (featureEnabled("X"))`) and verify paths are detected as conditionally reachable
- [ ] Verify the feature flag name/condition is captured in the reachability verdict
- [ ] Verify gated paths receive 0.5x confidence multiplier in risk scoring
- [ ] Verify rich graph annotations include feature flag gate details
- [ ] Verify reachability status shows "conditionally reachable" vs "reachable" distinction

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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 |