feat(intelligence): complete migration to Rust backend

- Unify all intelligence modules to use intelligenceClient
- Delete legacy TS implementations (agent-memory, reflection-engine, heartbeat-engine, context-compactor, agent-identity, memory-index)
- Update all consumers to use snake_case backend types
- Remove deprecated llm-integration.test.ts

This eliminates code duplication between frontend and backend, resolves
localStorage limitations, and enables persistent intelligence features.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

desktop/src/store/configStore.ts

@@ -136,6 +136,7 @@ export interface ConfigStateSlice {
   modelsError: string | null;
   error: string | null;
   client: ConfigStoreClient | null;
+  isLoading: boolean;
 }
 
 // === Store Actions Slice ===
@@ -208,6 +209,7 @@ export const useConfigStore = create<ConfigStateSlice & ConfigActionsSlice>((set
   modelsError: null,
   error: null,
   client: null,
+  isLoading: false,
 
   // Client Injection
   setConfigStoreClient: (client: ConfigStoreClient) => {