Resolve type annotation errors and local variable naming conflicts.

[401lrx]

• Fix bug / bug

💡 Background or solution

• The role_assign method of the TasksolvingRule class is invoked by the step method of the BasicEnvironment class in tasksolving. The agents passed during the call are of dictionary type and they are used as dictionaries within the role_assign method. Therefore, there exists a type annotation error.
• In the role_assign method of Rule class, the list of critic agents obtained by calling the astep method of role_assigner is saved in a variable named agents, which causes a naming conflict.