fix: Apply pre-commit hooks formatting fixes

- Remove trailing whitespace from all files
- Fix ruff formatting issues (2 errors resolved)
- Apply consistent code formatting across 3 files
- Ensure all files pass pre-commit validation

This resolves all CI formatting failures.

examples/mcp_integration_demo.py

@@ -19,19 +19,18 @@ from pathlib import Path
 sys.path.append(str(Path(__file__).parent.parent))
 
 
-
 async def demo_slack_mcp():
     """Demonstrate Slack MCP integration."""
     print("=" * 60)
     print("🔥 Slack MCP RAG Demo")
     print("=" * 60)
-    
+
     print("\n1. Testing Slack MCP server connection...")
-    
+
     # This would typically use a real MCP server command
     # For demo purposes, we show what the command would look like
     # slack_app = SlackMCPRAG()  # Would be used for actual testing
-    
+
     # Simulate command line arguments for testing
     class MockArgs:
         mcp_server = "slack-mcp-server"  # This would be the actual MCP server command
@@ -40,21 +39,21 @@ async def demo_slack_mcp():
         no_concatenate_conversations = False
         max_messages_per_channel = 50
         test_connection = True
-        
+
     print(f"MCP Server Command: {MockArgs.mcp_server}")
     print(f"Workspace: {MockArgs.workspace_name}")
     print(f"Channels: {', '.join(MockArgs.channels)}")
-    
+
     # In a real scenario, you would run:
     # success = await slack_app.test_mcp_connection(MockArgs)
-    
+
     print("\n📝 Example usage:")
     print("python -m apps.slack_rag \\")
     print("  --mcp-server 'slack-mcp-server' \\")
     print("  --workspace-name 'my-team' \\")
     print("  --channels general dev-team \\")
     print("  --test-connection")
-    
+
     print("\n🔍 After indexing, you could query:")
     print("- 'What did the team discuss about the project deadline?'")
     print("- 'Find messages about the new feature launch'")
@@ -66,11 +65,11 @@ async def demo_twitter_mcp():
     print("\n" + "=" * 60)
     print("🐦 Twitter MCP RAG Demo")
     print("=" * 60)
-    
+
     print("\n1. Testing Twitter MCP server connection...")
-    
+
     # twitter_app = TwitterMCPRAG()  # Would be used for actual testing
-    
+
     class MockArgs:
         mcp_server = "twitter-mcp-server"
         username = None  # Fetch all bookmarks
@@ -78,18 +77,18 @@ async def demo_twitter_mcp():
         no_tweet_content = False
         no_metadata = False
         test_connection = True
-        
+
     print(f"MCP Server Command: {MockArgs.mcp_server}")
     print(f"Max Bookmarks: {MockArgs.max_bookmarks}")
     print(f"Include Content: {not MockArgs.no_tweet_content}")
     print(f"Include Metadata: {not MockArgs.no_metadata}")
-    
+
     print("\n📝 Example usage:")
     print("python -m apps.twitter_rag \\")
     print("  --mcp-server 'twitter-mcp-server' \\")
     print("  --max-bookmarks 1000 \\")
     print("  --test-connection")
-    
+
     print("\n🔍 After indexing, you could query:")
     print("- 'What AI articles did I bookmark last month?'")
     print("- 'Find tweets about machine learning techniques'")
@@ -101,32 +100,32 @@ async def show_mcp_server_setup():
     print("\n" + "=" * 60)
     print("⚙️  MCP Server Setup Guide")
     print("=" * 60)
-    
+
     print("\n🔧 Setting up Slack MCP Server:")
     print("1. Install a Slack MCP server (example commands):")
     print("   npm install -g slack-mcp-server")
     print("   # OR")
     print("   pip install slack-mcp-server")
-    
+
     print("\n2. Configure Slack credentials:")
     print("   export SLACK_BOT_TOKEN='xoxb-your-bot-token'")
     print("   export SLACK_APP_TOKEN='xapp-your-app-token'")
-    
+
     print("\n3. Test the server:")
     print("   slack-mcp-server --help")
-    
+
     print("\n🔧 Setting up Twitter MCP Server:")
     print("1. Install a Twitter MCP server:")
     print("   npm install -g twitter-mcp-server")
     print("   # OR")
     print("   pip install twitter-mcp-server")
-    
+
     print("\n2. Configure Twitter API credentials:")
     print("   export TWITTER_API_KEY='your-api-key'")
     print("   export TWITTER_API_SECRET='your-api-secret'")
     print("   export TWITTER_ACCESS_TOKEN='your-access-token'")
     print("   export TWITTER_ACCESS_TOKEN_SECRET='your-access-token-secret'")
-    
+
     print("\n3. Test the server:")
     print("   twitter-mcp-server --help")
 
@@ -136,7 +135,7 @@ async def show_integration_benefits():
     print("\n" + "=" * 60)
     print("🌟 Benefits of MCP Integration")
     print("=" * 60)
-    
+
     benefits = [
         ("🔄 Live Data Access", "Fetch real-time data from platforms without manual exports"),
         ("🔌 Standardized Protocol", "Use any MCP-compatible server with minimal code changes"),
@@ -145,7 +144,7 @@ async def show_integration_benefits():
         ("📊 Rich Metadata", "Access full platform metadata (timestamps, engagement, etc.)"),
         ("⚡ Efficient Processing", "Stream data directly into LEANN without intermediate files"),
     ]
-    
+
     for title, description in benefits:
         print(f"\n{title}")
         print(f"   {description}")
@@ -155,12 +154,12 @@ async def main():
     """Main demo function."""
     print("🎯 LEANN MCP Integration Examples")
     print("This demo shows how to integrate LEANN with MCP servers for various platforms.")
-    
+
     await demo_slack_mcp()
     await demo_twitter_mcp()
     await show_mcp_server_setup()
     await show_integration_benefits()
-    
+
     print("\n" + "=" * 60)
     print("✨ Next Steps")
     print("=" * 60)
@@ -168,7 +167,7 @@ async def main():
     print("2. Test connections using --test-connection flag")
     print("3. Run indexing to build your RAG knowledge base")
     print("4. Start querying your personal data!")
-    
+
     print("\n📚 For more information:")
     print("- Check the README for detailed setup instructions")
     print("- Look at the apps/slack_rag.py and apps/twitter_rag.py for implementation details")