feat: Add gcloud-style command grouping to gt help output

Organize 43 commands into 7 logical groups using cobra's built-in
AddGroup/GroupID feature:

- Work Management: spawn, sling, hook, handoff, done, mol, mq, etc.
- Agent Management: mayor, witness, refinery, deacon, polecat, etc.
- Communication: mail, nudge, broadcast, peek
- Services: daemon, start, stop, up, down, shutdown
- Workspace: rig, crew, init, install, git-init, namepool
- Configuration: account, theme, hooks, issue, completion
- Diagnostics: status, doctor, prime, version, help

Also renamed molecule to mol as the primary command name
(molecule is now an alias).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

internal/cmd/mayor.go

@@ -17,6 +17,7 @@ const MayorSessionName = "gt-mayor"
 var mayorCmd = &cobra.Command{
 	Use:     "mayor",
 	Aliases: []string{"may"},
+	GroupID: GroupAgents,
 	Short:   "Manage the Mayor session",
 	Long: `Manage the Mayor tmux session.
 
@@ -126,7 +127,8 @@ func startMayorSession(t *tmux.Tmux) error {
 
 	// Launch Claude - the startup hook handles 'gt prime' automatically
 	// Use SendKeysDelayed to allow shell initialization after NewSession
-	claudeCmd := `claude --dangerously-skip-permissions`
+	// Export GT_ROLE in the command since tmux SetEnvironment only affects new panes
+	claudeCmd := `export GT_ROLE=mayor && claude --dangerously-skip-permissions`
 	if err := t.SendKeysDelayed(MayorSessionName, claudeCmd, 200); err != nil {
 		return fmt.Errorf("sending command: %w", err)
 	}