chore: bump version to 2.19.6 (#324)

Bump version to 2.19.6 to be higher than npm registry version (2.19.5).

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

Co-authored-by: Claude <noreply@anthropic.com>

package.runtime.json

@@ -1,6 +1,6 @@
 {
   "name": "n8n-mcp-runtime",
-  "version": "2.18.11",
+  "version": "2.19.6",
   "description": "n8n MCP Server Runtime Dependencies Only",
   "private": true,
   "dependencies": {