feat: add aliases and deacon status line display

- Add 'bd' alias for 'gt bead' command
- Add 'work' alias for 'gt hook' command
- Show deacon icon in mayor status line when running

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/cmd/hook.go

@@ -16,6 +16,7 @@ import (
 
 var hookCmd = &cobra.Command{
 	Use:     "hook [bead-id]",
+	Aliases: []string{"work"},
 	GroupID: GroupWork,
 	Short:   "Show or attach work on your hook",
 	Long: `Show what's on your hook, or attach new work.