semi implemented and features implemented save checkpoint

docs/features/unchecked/web/web-gateway-export-center-client.md

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+# Web Gateway Export Center Client (Profiles, Runs, SSE Streaming, Distributions)
+
+## Module
+Web
+
+## Status
+IMPLEMENTED
+
+## Description
+Web gateway client for Export Center APIs with profile/run management, SSE progress streaming, signed URL distribution, retention/encryption parameter support, and tenant-scoped RBAC enforcement.
+
+## Implementation Details
+- **Feature directory**: `src/Web/StellaOps.Web/src/app/shared/components/export-center/`
+- **Components**:
+  - `sarif-download` (`src/Web/StellaOps.Web/src/app/shared/components/export-center/sarif-download.component.ts`)
+- **Source**: SPRINT_0213_0001_0002_web_ii.md
+
+## 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 export/download action triggers correctly
+  - [ ] Verify the exported file is in the expected format (JSON, SARIF, CSV, etc.)
+  - [ ] Verify export includes all expected data fields
+- **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)