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/witness.go

@@ -22,8 +22,9 @@ var (
 )
 
 var witnessCmd = &cobra.Command{
-	Use:   "witness",
-	Short: "Manage the polecat monitoring agent",
+	Use:     "witness",
+	GroupID: GroupAgents,
+	Short:   "Manage the polecat monitoring agent",
 	Long: `Manage the Witness monitoring agent for a rig.
 
 The Witness monitors polecats for stuck/idle state, nudges polecats
@@ -330,7 +331,8 @@ func ensureWitnessSession(rigName string, r *rig.Rig) (bool, error) {
 	// Launch Claude directly (no shell respawn loop)
 	// Restarts are handled by daemon via LIFECYCLE mail or deacon health-scan
 	// NOTE: No gt prime injection needed - SessionStart hook handles it automatically
-	if err := t.SendKeys(sessionName, "claude --dangerously-skip-permissions"); err != nil {
+	// Export GT_ROLE in the command since tmux SetEnvironment only affects new panes
+	if err := t.SendKeys(sessionName, "export GT_ROLE=witness && claude --dangerously-skip-permissions"); err != nil {
 		return false, fmt.Errorf("sending command: %w", err)
 	}