Feature request: integrate the exptostd linter

Feature request: integrate the exptostd linter: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). There's a small static-analysis tool, exptostd (https://github.com/ldez/exptostd), that flags usages of functions from golang.org/x/exp/maps and golang.org/x/exp/slices…