fix: resolve SKILL.md validation errors

skills/bash-linux/SKILL.md

@@ -2,6 +2,8 @@
 name: bash-linux
 description: "Bash/Linux terminal patterns. Critical commands, piping, error handling, scripting. Use when working on macOS or Linux systems."
 allowed-tools: Read, Write, Edit, Glob, Grep, Bash
+risk: unknown
+source: community
 ---
 
 # Bash Linux Patterns
@@ -197,3 +199,6 @@ trap cleanup EXIT
 ---
 
 > **Remember:** Bash is text-based. Use `&&` for success chains, `set -e` for safety, and quote your variables!
+
+## When to Use
+This skill is applicable to execute the workflow or actions described in the overview.