fix: Correct amplihack description to include multi-CLI support

amplihack supports multiple CLIs (Claude Code, GitHub Copilot CLI,
Microsoft Amplifier, Rustyclawd), not just Claude Code.

Updated SKILL.md to accurately reflect multi-CLI nature.

Co-Authored-By: Claude Sonnet 4.5 (1M context) <noreply@anthropic.com>

Author: Ubuntu

.claude/skills/amplihack-expert/SKILL.md

@@ -57,7 +57,7 @@ references:
 
 ## What is amplihack?
 
-Agentic coding framework: 4 mechanisms, 23-step workflow, 30+ agents, 25 commands, 80+ skills.
+Multi-CLI agentic framework supporting Claude Code, GitHub Copilot CLI, Microsoft Amplifier, Rustyclawd. Features: 4 mechanisms, 23-step workflow, 30+ agents, 25 commands, 80+ skills.
 
 ## Quick Reference