Desire path: agents naturally try 'gt show <id>' to inspect beads.
This wraps 'bd show' via syscall.Exec, passing all flags through.
- Works with any prefix (gt-, bd-, hq-, etc.)
- Routes to correct beads database automatically
- DisableFlagParsing passes all flags to bd show
Closes gt-82jxwx
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
