feat: complete n8n integration with MCP Client Tool support and version badge automation
This major update adds comprehensive n8n integration, enabling n8n-mcp to run as an MCP server within n8n workflows using the MCP Client Tool node. ## Key Features ### n8n Integration (NEW) - Full MCP Client Tool compatibility with protocol version negotiation - Dedicated n8n mode with optimized Docker deployment - Workflow examples and n8n-friendly tool descriptions - Quick deployment script for easy setup ### Protocol & Compatibility - Intelligent protocol version selection (2024-11-05 for n8n, 2025-03-26 for others) - Fixed schema validation issues with n8n's nested output format - Enhanced parameter validation with clear error messages - Comprehensive test suite for protocol negotiation ### Security Enhancements - Dynamic UID/GID generation (10000-59999) for Docker containers - Improved error sanitization for production environments - Fixed information leakage in error responses - Enhanced permission handling for mounted volumes ### Performance Optimizations - Docker build time reduced from 13+ minutes to 1-2 minutes - Image size reduced from ~1.5GB to ~280MB - Fixed ARM64 build failures - Optimized to use runtime-only dependencies ### Developer Experience - Comprehensive parameter validation for all MCP tools - Made README version badge dynamic from package.json - Enhanced test coverage with session management tests - Improved CI/CD with informational patch coverage ### Documentation - Added comprehensive N8N_DEPLOYMENT.md guide - Updated CHANGELOG.md for version 2.9.0 - Enhanced CLAUDE.md with n8n-specific instructions - Added deployment scripts and examples ## Technical Details Files Added: - Dockerfile.n8n, docker-compose.n8n.yml for n8n deployment - Protocol version negotiation utilities - n8n integration test suite - Session management tests - Deployment and test scripts - Version badge update scripts Files Modified: - Enhanced MCP server with n8n mode support - Improved HTTP server with better error handling - Updated Docker configurations for security - Enhanced logging for n8n compatibility - CHANGELOG.md with comprehensive update description This update makes n8n-mcp a first-class citizen in the n8n ecosystem, enabling powerful AI-assisted workflow automation. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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