fix: guard against non-LLM recipients in speak_to tool(#158)#161

BhoomiAgrawal12 wants to merge 4 commits intomesa:mainmesa/mesa-llm:mainfrom

BhoomiAgrawal12:fix/speak-to-non-llm-recipientBhoomiAgrawal12/mesa-llm:fix/speak-to-non-llm-recipientCopy head branch name to clipboard