fix: import load_from_optimizer lazily to break a spawn-time cycle - #368
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Importing it at module scope pulls in bergson.gradients, which re-enters the package __init__ and reaches magic.cli -> validate -> magic.trainer. In-process that resolves, but a spawned worker unpickling through magic.cli hits magic.trainer half-initialized and fails on TrainerState, taking out test_grad_accum_matches_full_batch.
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