fix: quote description to fix YAML parsing error

The colon in the description was being interpreted as a YAML mapping
value separator, causing a parsing error.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: yepzdk

skills/github-issue-workflow.md

@@ -1,6 +1,6 @@
 ---
 name: github-issue-workflow
-description: Autonomous GitHub issue workflow: develop, test, review, merge. Use this skill to work through GitHub issues with minimal user interaction - only pausing when user review/merge is required.
+description: "Autonomous GitHub issue workflow: develop, test, review, merge. Use this skill to work through GitHub issues with minimal user interaction - only pausing when user review/merge is required."
 ---
 
 # GitHub Issue Workflow