feat: Implement n8n-MCP Enhancement Plan v2.1 Final

- Implement simple node loader supporting n8n-nodes-base and langchain packages
- Create parser handling declarative, programmatic, and versioned nodes
- Build documentation mapper with 89% coverage (405/457 nodes)
- Setup SQLite database with minimal schema
- Create rebuild script for one-command database updates
- Implement validation script for critical nodes
- Update MCP server with documentation-focused tools
- Add npm scripts for streamlined workflow

Successfully loads 457/458 nodes with accurate documentation mapping.
Versioned node detection working (46 nodes detected).
3/4 critical nodes pass validation tests.

Known limitations:
- Slack operations extraction incomplete for some versioned nodes
- One langchain node fails due to missing dependency
- No AI tools detected (none have usableAsTool flag)

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/mcp/index.ts

@@ -0,0 +1,19 @@
+#!/usr/bin/env node
+
+import { N8NDocumentationMCPServer } from './server-update';
+import { logger } from '../utils/logger';
+
+async function main() {
+  try {
+    const server = new N8NDocumentationMCPServer();
+    await server.run();
+  } catch (error) {
+    logger.error('Failed to start MCP server', error);
+    process.exit(1);
+  }
+}
+
+// Run if called directly
+if (require.main === module) {
+  main().catch(console.error);
+}