Add comprehensive tests for vector/semantic search functionality

- Implement full coverage tests for Embedder model loading and embedding generation
- Add CRUD operations and caching tests for VectorStore
- Include cosine similarity computation tests
- Validate semantic search accuracy and relevance through various queries
- Establish performance benchmarks for embedding and search operations
- Ensure edge cases and error handling are covered
- Test thread safety and concurrent access scenarios
- Verify availability of semantic search dependencies

ccw/src/tools/cli-history-store.ts

@@ -463,6 +463,26 @@ export class CliHistoryStore {
     };
   }
 
+  /**
+   * Get conversation with native session info
+   */
+  getConversationWithNativeInfo(id: string): (ConversationRecord & {
+    hasNativeSession: boolean;
+    nativeSessionId?: string;
+    nativeSessionPath?: string;
+  }) | null {
+    const conv = this.getConversation(id);
+    if (!conv) return null;
+
+    const mapping = this.getNativeSessionMapping(id);
+    return {
+      ...conv,
+      hasNativeSession: !!mapping,
+      nativeSessionId: mapping?.native_session_id,
+      nativeSessionPath: mapping?.native_session_path
+    };
+  }
+
   /**
    * Query execution history
    */