fix: resolve SKILL.md validation errors

skills/unity-ecs-patterns/SKILL.md

@@ -1,6 +1,8 @@
 ---
 name: unity-ecs-patterns
 description: "Master Unity ECS (Entity Component System) with DOTS, Jobs, and Burst for high-performance game development. Use when building data-oriented games, optimizing performance, or working with large ent..."
+risk: unknown
+source: community
 ---
 
 # Unity ECS Patterns