fix: explore 段落命中两级回退（原词→展开词）+ expandKeywords 去重 + HardBudget 接入

ax_rd

4 hours ago a7fbbfd6f974631eadebc6effca8ce7982592786

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package main
 
import "github.com/aisim/kb-cli/cmd"
 
func main() {
    cmd.Execute()
}