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Implements #17 for all adv optimizers via a new setting (
MSign_interval). This controls the interval for applying the Matrix-Sign (MSign) operation to the weights (e.g.,MSign_interval=100applies MSign every 100 steps).Instead of orthogonalizing the weights using a costly SVD, we use iterative CANS (Chebyshev-Optimized Newton-Schulz) with the total number of matrix multiplications (matmuls) set to 30.