fix: resolve SKILL.md validation errors

skills/rust-async-patterns/SKILL.md

@@ -1,6 +1,8 @@
 ---
 name: rust-async-patterns
 description: "Master Rust async programming with Tokio, async traits, error handling, and concurrent patterns. Use when building async Rust applications, implementing concurrent systems, or debugging async code."
+risk: unknown
+source: community
 ---
 
 # Rust Async Patterns