[FEATURE]: Auto Subtask switching

[plsgivemeachane]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

Basically I think it is better to have automatically switch to subtask when an primary agent called Task. And also after finish the task, is automatically return to the primary agent.

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• [FEATURE]: command that is run as a subtask if in an existing session, as the main task if in a new session #5553: command that is run as a subtask if in an existing session, as the main task if in a new session
• Custom commands with agents should(?) change to the agent session. #3329: Custom commands with agents should change to the agent session
• Add interactive session switcher for navigating between subagent sessions #6183: Add interactive session switcher for navigating between subagent sessions

Feel free to ignore if none of these address your specific case.

[plsgivemeachane]

Duplicated of #3329