Bump to 0.5.27 + Add experimental Parallel Step#280
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Replace the hand-rolled PackedExperiment packing with exca 0.5.27's Parallel step (facebookresearch/exca#280). Pending experiments are dispatched as one sweep into ceil(pending/N) array elements, each still caching under its own TaskInfra identity, so re-running the grid without packing hits the same caches. - packing.py: PackedExperiment/pack_experiments_for_submission -> submit_packed() + a thin _ExperimentStep wrapper delegating to experiment.run(); exca owns chunking, claim coordination and shuffling. - Drop --local-workers-per-job: variants in one scheduler element run serially, so in-job multiprocessing has no equivalent. - Bump exca to >=0.5.27; fix stale _FakeAggregator test stub.
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