Speed up checkpoint recovery with bounded parallel reads - #165
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Read checkpoint batches concurrently with a bounded thread pool, then validate and restore them in commit order. Keep the existing integrity checks and checkpoint format. Cancel queued reads on failure and log validation time.
Validation: 87 tests passed, 4 skipped; read-only Modal testing reduced recovery from 18m18s to 5m38s.
Existing runs still require their original Gasbench pin because checkpoints verify evaluator identity.