feat(prompts): add facet guard and length limits to memory_merge_bundle#533

lishixiang0705 wants to merge 1 commit intovolcengine:mainvolcengine/OpenViking:mainfrom

lishixiang0705:fix/memory-merge-facet-guard-and-length-limitslishixiang0705/OpenViking:fix/memory-merge-facet-guard-and-length-limitsCopy head branch name to clipboard