fix: more aggressive auto-install for bun script

Replace gh copilot aliases with custom Fish functions that provide
better help
text and wrap the copilot CLI with appropriate prompts

home/dot_local/bin/executable_claude-usage

@@ -1,4 +1,4 @@
-#!/usr/bin/env -S bun --install=fallback
+#!/usr/bin/env -S bun --install=auto
 
 /**
  * claude-usage - Fast CLI tool to fetch Anthropic Claude usage percentages