save checkpoint: save features

docs/features/checked/web/proof-spine-ui-component.md

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+# Proof Spine UI component (segmented visualization with badges)
+
+## Module
+Web
+
+## Status
+VERIFIED
+
+## Description
+Angular proof-spine component suite with segment visualization, badge rows, detail modals, and e2e tests.
+
+## Implementation Details
+- **Feature directory**: `src/Web/StellaOps.Web/src/app/shared/components/proof-spine/`
+- **Components**:
+  - `chain-integrity-badge` (`src/Web/StellaOps.Web/src/app/shared/components/proof-spine/chain-integrity-badge.component.ts`)
+  - `proof-badges-row` (`src/Web/StellaOps.Web/src/app/shared/components/proof-spine/proof-badges-row.component.ts`)
+  - `proof-segment` (`src/Web/StellaOps.Web/src/app/shared/components/proof-spine/proof-segment.component.ts`)
+  - `proof-spine` (`src/Web/StellaOps.Web/src/app/shared/components/proof-spine/proof-spine.component.ts`)
+  - `segment-detail-modal` (`src/Web/StellaOps.Web/src/app/shared/components/proof-spine/segment-detail-modal.component.ts`)
+- **Source**: Feature matrix scan
+
+## E2E Test Plan
+- **Setup**:
+  - [ ] Log in with a user that has appropriate permissions
+  - [ ] Navigate to the relevant page/section where this feature appears
+  - [ ] 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/proof-spine-ui-component/run-001/`
+- Date (UTC): 2026-02-11