fix(copilot): refine ownership checks and command error handling

src/commands/copilot-command.ts

@@ -49,7 +49,8 @@ export async function handleCopilotCommand(args: string[]): Promise<number> {
     default:
       console.error(fail(`Unknown subcommand: ${subcommand}`));
       console.error('');
-      return handleHelp();
+      handleHelp();
+      return 1;
   }
 }