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docs/features/checked/web/delta-summary-strip.md

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+# Delta Summary Strip
+
+## Module
+Web
+
+## Status
+VERIFIED
+
+## Description
+Delta summary strip component shows before/after comparison statistics in the compare view header.
+
+## Implementation Details
+- **Feature directory**: `src/Web/StellaOps.Web/src/app/features/compare/`
+- **Components**:
+  - `actionables-panel` (`src/Web/StellaOps.Web/src/app/features/compare/components/actionables-panel/actionables-panel.component.ts`)
+  - `baseline-rationale` (`src/Web/StellaOps.Web/src/app/features/compare/components/baseline-rationale/baseline-rationale.component.ts`)
+  - `baseline-selector` (`src/Web/StellaOps.Web/src/app/features/compare/components/baseline-selector.component.ts`)
+  - `categories-pane` (`src/Web/StellaOps.Web/src/app/features/compare/components/categories-pane.component.ts`)
+  - `compare-view` (`src/Web/StellaOps.Web/src/app/features/compare/components/compare-view.component.ts`)
+  - `compare-view` (`src/Web/StellaOps.Web/src/app/features/compare/components/compare-view/compare-view.component.ts`)
+  - `degraded-mode-banner` (`src/Web/StellaOps.Web/src/app/features/compare/components/degraded-mode-banner/degraded-mode-banner.component.ts`)
+  - `delta-summary-strip` (`src/Web/StellaOps.Web/src/app/features/compare/components/delta-summary-strip.component.ts`)
+  - `envelope-hashes` (`src/Web/StellaOps.Web/src/app/features/compare/components/envelope-hashes/envelope-hashes.component.ts`)
+  - `export-actions` (`src/Web/StellaOps.Web/src/app/features/compare/components/export-actions/export-actions.component.ts`)
+  - `graph-mini-map` (`src/Web/StellaOps.Web/src/app/features/compare/components/graph-mini-map/graph-mini-map.component.ts`)
+  - `items-pane` (`src/Web/StellaOps.Web/src/app/features/compare/components/items-pane.component.ts`)
+  - `proof-pane` (`src/Web/StellaOps.Web/src/app/features/compare/components/proof-pane.component.ts`)
+  - `three-pane-layout` (`src/Web/StellaOps.Web/src/app/features/compare/components/three-pane-layout.component.ts`)
+  - `trust-indicators` (`src/Web/StellaOps.Web/src/app/features/compare/components/trust-indicators.component.ts`)
+  - ... and 3 more components
+- **Services**:
+  - `compare-export` (`src/Web/StellaOps.Web/src/app/features/compare/services/compare-export.service.ts`)
+  - `compare` (`src/Web/StellaOps.Web/src/app/features/compare/services/compare.service.ts`)
+  - `delta-compute` (`src/Web/StellaOps.Web/src/app/features/compare/services/delta-compute.service.ts`)
+  - `user-preferences` (`src/Web/StellaOps.Web/src/app/features/compare/services/user-preferences.service.ts`)
+- **Source**: Feature matrix scan
+
+## E2E Test Plan
+- **Setup**:
+  - [ ] Log in with a user that has appropriate permissions
+  - [ ] Navigate to `/compare/:currentId`
+  - [ ] Ensure test data exists (scanned artifacts, SBOM data, or seed data as needed)
+- **Core verification**:
+  - [ ] Verify the component renders correctly with sample data
+  - [ ] Verify interactive elements respond to user input
+  - [ ] Verify data is fetched and displayed from the correct API endpoints
+- **Edge cases**:
+  - [ ] Verify graceful handling when backend API is unavailable (error state)
+  - [ ] Verify responsive layout at different viewport sizes
+  - [ ] Verify accessibility (keyboard navigation, screen reader labels, ARIA attributes)
+
+## Verification
+- Run: `docs/qa/feature-checks/runs/web/delta-summary-strip/run-001/`
+- Tier 0 (source): pass (`tier0-source-check.json`)
+- Tier 1 (build/tests): pass (`tier1-build-check.json`)
+- Tier 2 (behavior): pass (`tier2-e2e-check.json`)
+- Verified on (UTC): 2026-02-10