Repair hierarchical ML evaluator aggregation and produce an offline integration artifact.

Repair hierarchical ML evaluator aggregation and produce an offline integration artifact.: a task in MiMo-V2.6-RL-harbor-terminal: MiMo-V2.6-RL Terminal (Harbor) (Harbor dataset). The evaluator in /app/vendor/lm-evaluation-harness has a regression in hierarchical metric aggregation. Diagnose the…