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Add classical SGD + momentum to stock GPT-2 Small FineWeb TPU speedrun - #170
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Adds
sgd_momentumas an optimizer option in the existing SHA256-pinned stock GPT-2 Small training path, with 0.9 momentum, zero decay, and an explicitly untuned 0.01 peak learning-rate candidate. Retains architecture, data, validation, warmup/cosine schedule, 19,560-step budget, gradient clipping, checkpointing and WeightWatcher tracking. Adds a CPU regression test for tied parameter ownership and momentum update math, and a validation-only hyperparameter sweep protocol.Not run: TPU preflight, training, hyperparameter sweep, or CI. Do not claim these are best hyperparameters without validation evidence.