enhance: history snapshot clean PR3409

[Wendong-Fan]

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[nitpicker55555]

It looks like we removed all snapshot ref decorations, including those for the latest snapshot. As a result, the agent is now completely unable to operate. Ideally, we should only clean up the historical snapshots, right?
This is also why it seems we can only make changes inside the chatagent.py, the toolkit is stateless and has no ability to modify historical information.

[Wendong-Fan]

It looks like we removed all snapshot ref decorations, including those for the latest snapshot. As a result, the agent is now completely unable to operate. Ideally, we should only clean up the historical snapshots, right? This is also why it seems we can only make changes inside the chatagent.py, the toolkit is stateless and has no ability to modify historical information.

thanks @nitpicker55555 , this refactor needs more time to implement, i will merge #3832 as a temporary solution

cc @fengju0213