semi implemented and features implemented save checkpoint

docs/features/unchecked/web/visual-workflow-editor.md

@@ -0,0 +1,36 @@
+# Visual Workflow Editor (DAG-Based)
+
+## Module
+Web
+
+## Status
+IMPLEMENTED
+
+## Description
+Visual DAG-based workflow editor with drag-and-drop step palette, step configuration panel, connection validation, and YAML view with syntax highlighting.
+
+## Implementation Details
+- **Feature directory**: `src/Web/StellaOps.Web/src/app/features/workflow-visualization/`
+- **Routes**: `workflow-visualization.routes.ts`
+- **Components**:
+  - `step-detail-panel` (`src/Web/StellaOps.Web/src/app/features/workflow-visualization/components/step-detail-panel/step-detail-panel.component.ts`)
+  - `time-travel-controls` (`src/Web/StellaOps.Web/src/app/features/workflow-visualization/components/time-travel-controls/time-travel-controls.component.ts`)
+  - `workflow-visualizer` (`src/Web/StellaOps.Web/src/app/features/workflow-visualization/components/workflow-visualizer/workflow-visualizer.component.ts`)
+- **Services**:
+  - `time-travel` (`src/Web/StellaOps.Web/src/app/features/workflow-visualization/services/time-travel.service.ts`)
+  - `workflow-visualization` (`src/Web/StellaOps.Web/src/app/features/workflow-visualization/services/workflow-visualization.service.ts`)
+- **Source**: SPRINT_20260110_111_004_FE_workflow_editor.md
+
+## E2E Test Plan
+- **Setup**:
+  - [ ] Log in with a user that has appropriate permissions
+  - [ ] Navigate to `/release-orchestrator`
+  - [ ] Ensure test data exists (scanned artifacts, SBOM data, or seed data as needed)
+- **Core verification**:
+  - [ ] Verify the editor/studio loads with editable content or empty template
+  - [ ] Verify changes can be saved and persisted
+  - [ ] Verify validation errors are displayed for invalid input
+- **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)