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

.gitignore

@@ -69,3 +69,22 @@ docker-compose.override.yml
 # Temporary files
 temp/
 tmp/
+
+# Database files
+data/*.db
+data/*.db-journal
+data/*.db.bak
+!data/.gitkeep
+
+# Claude Desktop configs (personal)
+claude_desktop_config.json
+claude_desktop_config_*.json
+!claude_desktop_config.example.json
+
+# Personal wrapper scripts
+mcp-server-v20.sh
+rebuild-v20.sh
+!mcp-server-v20.example.sh
+
+# n8n-docs repo (cloned locally)
+../n8n-docs/