# Reachability Witnessing UI

## Module
Web

## Status
VERIFIED

## Description
Mounted the canonical `Security > Reachability` shell for coverage, witnesses, proof-of-exposure, and sensor-gap investigation. Operators can drill from findings, triage, evidence replay, and release detail into one witness-detail experience with return-to-context preserved, drawer-first proof inspection, and export or verify actions.

## Implementation Details
- **Feature directory**: `src/Web/StellaOps.Web/src/app/features/reachability/`
- **Primary components**:
  - `reachability-center` (`src/Web/StellaOps.Web/src/app/features/reachability/reachability-center.component.ts`)
  - `witness-page` (`src/Web/StellaOps.Web/src/app/features/reachability/witness-page.component.ts`)
  - `poe-drawer` (`src/Web/StellaOps.Web/src/app/features/reachability/poe-drawer.component.ts`)
- **Canonical routes**:
  - `/security/reachability/coverage`
  - `/security/reachability/witnesses`
  - `/security/reachability/witnesses/:witnessId`
  - `/security/reachability/poe`
  - `/security/reachability/poe/:artifactId`
  - `/security/reachability/gaps`
- **Secondary entry points**:
  - `Security > Findings`
  - `Triage > Artifact Workspace`
  - `Evidence > Verify & Replay`
  - `Releases > Detail`
- **Source**: shipped reachability owner shell with witness-detail and PoE deep-link contract

## E2E Test Plan
- **Setup**:
  - [ ] Log in with a user that can view Security, Evidence, and Releases.
  - [ ] Navigate to `/security/reachability/witnesses`.
  - [ ] Ensure witness API data exists or fallback fixtures are enabled.
- **Core verification**:
  - [ ] Verify `Coverage`, `Witnesses`, `PoE / Exposure`, and `Sensor Gaps` render in one mounted shell.
  - [ ] Verify witness search, filters, and witness-detail drill-in work.
  - [ ] Verify PoE drawer, PoE permalink route, export, and verify actions work.
- **Cross-shell verification**:
  - [ ] Verify findings, triage, evidence replay, and release detail link into the canonical reachability routes.
  - [ ] Verify `returnTo` restores the original workflow context.
  - [ ] Verify fallback fixtures render a clear degraded-mode message when the backend is unavailable.

## Verification
- Run:
  - `npx ng test --watch=false --include src/tests/reachability_center/reachability-center.component.spec.ts --include src/tests/reachability_center/witness-page.component.spec.ts --include src/tests/security-risk/security-risk-routes.spec.ts --include src/tests/security-risk/finding-detail-page-reachability-handoff.spec.ts --include src/tests/triage/triage-workspace-with-proof-tree.behavior.spec.ts --include src/tests/evidence/replay-controls-reachability-handoff.spec.ts --include src/tests/releases/release-detail.live-refresh.spec.ts`
  - `npx playwright test tests/e2e/reachability-witnessing.spec.ts --workers=1`
- Tier 0 (source): pass
- Tier 1 (build/tests): pass
- Tier 2 (behavior): pass
- Verified on (UTC): 2026-03-07T18:25:00Z