Implement Stage 3: Enhance content metadata and validation features

- Added entity metadata fields to the Tasks model, including entity_type, taxonomy, and cluster_role.
- Updated CandidateEngine to prioritize content relevance based on cluster mappings.
- Introduced metadata completeness scoring in ContentAnalyzer.
- Enhanced validation services to check for entity type and mapping completeness.
- Updated frontend components to display and validate new metadata fields.
- Implemented API endpoints for content validation and metadata persistence.
- Migrated existing data to populate new metadata fields for Tasks and Content.

frontend/src/store/builderWorkflowStore.ts

@@ -42,6 +42,7 @@ interface BuilderWorkflowState {
   // Actions
   initialize: (blueprintId: number) => Promise<void>;
   refreshState: () => Promise<void>;
+  refreshContext: () => Promise<void>; // Alias for refreshState
   goToStep: (step: WizardStep) => void;
   completeStep: (step: WizardStep, metadata?: Record<string, any>) => Promise<void>;
   setBlockingIssue: (step: WizardStep, message: string) => void;
@@ -116,6 +117,11 @@ export const useBuilderWorkflowStore = create<BuilderWorkflowState>()(
         await get().initialize(blueprintId);
       },
       
+      refreshContext: async () => {
+        // Alias for refreshState
+        await get().refreshState();
+      },
+      
       goToStep: (step: WizardStep) => {
         set({ currentStep: step });