fix: shorten action description for marketplace compliance

- Reduce description from 184 to 108 characters
- Meets GitHub Marketplace 125 character limit requirement

Author: stephenway

action.yml

@@ -1,5 +1,5 @@
 name: 'Commit Coach'
-description: 'An intelligent commit analysis tool that provides insights and coaching for code changes. Analyzes commits for missing tests, security issues, code quality, and provides actionable feedback.'
+description: 'Intelligent commit analysis tool providing insights for code changes, security issues, and test coverage.'
 author: 'Stephen Way'
 branding:
   icon: 'eye'