Document ridge_weights parameter in fit_sinusoidal_regression

[Copilot]

The ridge_weights parameter in fit_sinusoidal_regression was added in PR #45 but not documented in the function's docstring.

Changes

• Added docstring entry for ridge_weights parameter explaining:
  • Accepts optional sequence of per-column regularization weights
  • Length must equal design matrix column count (including intercept if intercept=True)
  • Intercept column weight automatically set to 0.0 when intercept=True

def fit_sinusoidal_regression(
    X: np.ndarray,
    Y: np.ndarray,
    N_list: Sequence[int],
    ridge_weights: Optional[Sequence[float]] = None,  # Now documented
    ...
):
    """
    Parameters:
        ridge_weights: optional sequence of per-column regularization weights. Must have length
            equal to the number of design matrix columns (including the intercept column if
            intercept=True). When intercept=True, the intercept column weight is automatically
            set to 0.0 to avoid regularizing the intercept term.
    """

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