feat(action): optimise metadata for GitHub Marketplace compatibility

Shorten description to 100 characters to meet GitHub Marketplace
requirements. Change icon from 'monitor' to 'search' to better
represent the detection and discovery functionality of the action.

Author: tcpipuk

action.yml

@@ -1,12 +1,8 @@
 name: 'Detect OS and Runtime Versions'
-description: |
-  Detect the actual OS name and version of the runner, plus installed runtime versions.
-  Provides separate outputs for OS details (name, version, slug, architecture) and
-  language runtimes (Node.js, Python, Rust) with semantic versioning components.
-  Works across Linux distributions, macOS, and Windows runners.
+description: 'Detect OS and runtime versions with semantic versioning outputs for GitHub/Forgejo workflows'
 
 branding:
-  icon: 'monitor'
+  icon: 'search'
   color: 'blue'
 
 outputs: