fix(server): prevent duplicate and subagent history imports - #11807

fix(server): prevent duplicate and subagent history imports#11807

adamblumoff wants to merge 4 commits into

pingdotgg:mainpingdotgg/t3code:mainfrom

adamblumoff:fix/review-agent-history-importadamblumoff/t3code:fix/review-agent-history-importCopy head branch name to clipboard