[step] Refactor around Runner - #335
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Before this, each
StepItemscarried anupstreamprefix and amode, and every step re-derived its cache context from them. This PR moves that context into a frozenbase.Runner(prefix, mode):runner.dispatch(step, batch)runs a step: warm carrier, inline, or backend.runner.advance(step)gives the context of the next step.runner.paths(step)gives the step's cache layout.StepItemsis reduced to source + pending + uids.Removed:
StepItems(upstream=, mode=),StepItems.apply_step,select(mode=),Step._dispatch,Step._make_paths,Chain._walk_steps,ComputeBatch.cached_items, and twoCoordinationInfofields. Net is about -60 lines._run_items(runner, batch),Backend._run/_prepare(runner, step, batch),lookup(_runner=)(replaces_upstream=).forceinside an uncached container (e.g. aScatterbody without infra) now also recomputes downstream steps.