fix: resolve SKILL.md validation errors

skills/nodejs-backend-patterns/SKILL.md

@@ -1,6 +1,8 @@
 ---
 name: nodejs-backend-patterns
 description: "Build production-ready Node.js backend services with Express/Fastify, implementing middleware patterns, error handling, authentication, database integration, and API design best practices. Use when..."
+risk: unknown
+source: community
 ---
 
 # Node.js Backend Patterns