# Reachability Query API and Triage Flow

## Module
Cli

## Status
IMPLEMENTED

## Description
CLI commands and policy engine services consume reachability facts to drive triage decisions (reachable/unreachable/unknown).

## Implementation Details
- **Command Group**: `src/Cli/StellaOps.Cli/Commands/ReachabilityCommandGroup.cs` -- reachability query commands
- **ReachGraph Commands**: `src/Cli/StellaOps.Cli/Commands/ReachGraph/ReachGraphCommandGroup.cs` -- graph query operations
- **Commands**:
  - `stella reachability list --scan <id>` -- list reachability results
  - `stella reachability explain <cve>` -- explain reachability determination
  - `stella reachability query <cve> --digest <digest>` -- query reachability for specific CVE/artifact pair

## E2E Test Plan
- [ ] Run `stella reachability list --scan <id>` and verify reachability results (reachable/unreachable/unknown)
- [ ] Run `stella reachability explain CVE-2024-1234` and verify explanation with call path evidence
- [ ] Run `stella reachability query CVE-2024-1234 --digest sha256:abc123` and verify specific query
- [ ] Verify triage decisions based on reachability status
- [ ] Verify `--format json` output