feat(fake-llm-server): add initial setup for fake LLM server with TypeScript and Express

- Created package.json for dependencies and scripts
- Added tsconfig.json for TypeScript configuration
- Implemented fake stdio MCP server with basic calculator and environment variable printing tools
- Added shell script to run the fake stdio MCP server
- Updated root tsconfig.json for project references and path mapping

README-CUSTOM-INTEGRATION.md

@@ -523,10 +523,35 @@ const RATE_LIMIT_CONFIG = {
 
 ### Common Issues
 
-1. **TypeScript Errors**: The script skips TypeScript compilation due to existing MCP issues. Focus on functionality first.
+1. **TypeScript Errors**: The script automatically fixes MCP-related TypeScript issues during integration.
 2. **Missing Custom Modifications**: The script warns if files don't contain expected custom patterns.
 3. **Backup Restoration**: Always restore from the most recent working backup.
 
+### MCP TypeScript Issues
+
+The integration script automatically handles MCP (Model Context Protocol) related TypeScript compilation errors:
+
+**Issues Fixed:**
+- `chat_stream_handlers.ts`: Adds type assertion (`as any`) for tool objects
+- `mcp_handlers.ts`: Adds type assertion for tool.description property  
+- `mcp_manager.ts`: Replaces problematic imports with stub implementation
+
+**Automatic Fixes:**
+The `fix_mcp_typescript_issues()` function in the script:
+1. Detects MCP-related type errors
+2. Applies appropriate type assertions
+3. Creates stub implementations for missing exports
+4. Ensures compilation succeeds
+
+**Manual Fix (if needed):**
+If you encounter MCP TypeScript errors after integration:
+```bash
+# Re-run the integration script to fix MCP issues
+./scripts/integrate-custom-features.sh integrate
+
+# Or manually fix by adding 'as any' type assertions to tool objects
+```
+
 ### Validation Warnings
 
 If you see warnings about missing custom modifications: