I want runner.Runner to provide a stateful flow execution lifecycle with func (r Runner) Do(ctx…

I want runner.Runner to provide a stateful flow execution lifecycle with func (r Runner) Do(ctx…: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). Eval(ctx) should run the runner's Flow through the configured evaluator services, start and flush a run trace using…

The task

`Eval(ctx)` should run the runner's `Flow` through the configured evaluator services, start and flush a run trace using `Cmdline`, log the evaluator summary on success, and return the final rendered result string. If `Type` is nil, the result should be rendered as a `reflow.Fileset` string; otherwise it should be…

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.