feat: implement node parser and property extractor with versioned node support

SETUP.md

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+# n8n-MCP Setup Guide
+
+This guide will help you set up n8n-MCP with Claude Desktop.
+
+## Prerequisites
+
+- Node.js v20.17.0 (required for Claude Desktop)
+- npm (comes with Node.js)
+- Git
+- Claude Desktop app
+
+## Step 1: Install Node.js v20.17.0
+
+### Using nvm (recommended)
+
+```bash
+# Install nvm if you haven't already
+curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.0/install.sh | bash
+
+# Install Node v20.17.0
+nvm install 20.17.0
+nvm use 20.17.0
+```
+
+### Direct installation
+
+Download and install Node.js v20.17.0 from [nodejs.org](https://nodejs.org/)
+
+## Step 2: Clone the Repository
+
+```bash
+# Clone n8n-mcp
+git clone https://github.com/yourusername/n8n-mcp.git
+cd n8n-mcp
+
+# Clone n8n documentation (required)
+git clone https://github.com/n8n-io/n8n-docs.git ../n8n-docs
+```
+
+## Step 3: Install and Build
+
+```bash
+# Install dependencies
+npm install
+
+# Build the project
+npm run build
+
+# Initialize the database
+npm run rebuild
+
+# Verify installation
+npm run test-nodes
+```
+
+Expected output:
+```
+🧪 Running node tests...
+✅ nodes-base.httpRequest passed all checks
+✅ nodes-base.slack passed all checks
+✅ nodes-base.code passed all checks
+📊 Test Results: 3 passed, 0 failed
+```
+
+## Step 4: Configure Claude Desktop
+
+### macOS
+
+1. Copy the example configuration:
+```bash
+cp claude_desktop_config.example.json ~/Library/Application\ Support/Claude/claude_desktop_config.json
+```
+
+2. Edit the configuration file:
+```bash
+nano ~/Library/Application\ Support/Claude/claude_desktop_config.json
+```
+
+3. Update the path to your installation:
+```json
+{
+  "mcpServers": {
+    "n8n-documentation": {
+      "command": "/Users/yourusername/path/to/n8n-mcp/mcp-server-v20.sh",
+      "args": []
+    }
+  }
+}
+```
+
+### Windows
+
+1. Copy the example configuration:
+```bash
+copy claude_desktop_config.example.json %APPDATA%\Claude\claude_desktop_config.json
+```
+
+2. Edit the configuration with the full path to your installation.
+
+## Step 5: Create the Wrapper Script
+
+1. Copy the example wrapper script:
+```bash
+cp mcp-server-v20.example.sh mcp-server-v20.sh
+chmod +x mcp-server-v20.sh
+```
+
+2. Edit the script if your nvm path is different:
+```bash
+nano mcp-server-v20.sh
+```
+
+## Step 6: Restart Claude Desktop
+
+1. Quit Claude Desktop completely
+2. Start Claude Desktop again
+3. You should see "n8n-documentation" in the MCP tools menu
+
+## Troubleshooting
+
+### Node version mismatch
+
+If you see errors about NODE_MODULE_VERSION:
+```bash
+# Make sure you're using Node v20.17.0
+node --version  # Should output: v20.17.0
+
+# Rebuild native modules
+npm rebuild better-sqlite3
+```
+
+### Database not found
+
+```bash
+# Rebuild the database
+npm run rebuild
+```
+
+### Permission denied
+
+```bash
+# Make the wrapper script executable
+chmod +x mcp-server-v20.sh
+```
+
+### Claude Desktop doesn't see the MCP server
+
+1. Check the config file location:
+   - macOS: `~/Library/Application Support/Claude/claude_desktop_config.json`
+   - Windows: `%APPDATA%\Claude\claude_desktop_config.json`
+
+2. Verify the path in the config is absolute and correct
+
+3. Check Claude Desktop logs:
+   - macOS: `~/Library/Logs/Claude/mcp.log`
+
+## Testing the Integration
+
+Once configured, you can test the integration in Claude Desktop:
+
+1. Open a new conversation
+2. Ask: "What MCP tools are available?"
+3. You should see the n8n documentation tools listed
+
+Example queries to test:
+- "List all n8n trigger nodes"
+- "Show me the properties of the HTTP Request node"
+- "Search for nodes that work with Slack"
+- "What AI tools are available in n8n?"
+
+## Updating
+
+To update to the latest version:
+
+```bash
+git pull
+npm install
+npm run build
+npm run rebuild
+```
+
+## Development Mode
+
+For development with hot reloading:
+
+```bash
+# Make sure you're using Node v20.17.0
+nvm use 20.17.0
+
+# Run in development mode
+npm run dev
+```