Function form_analysis 

pub fn form_analysis(
    n_dims: usize,
    g: &dyn Fn(&[f64]) -> f64,
    max_iter: usize,
    tol: f64,
    h: f64,
) -> FormResult

First-Order Reliability Method (FORM) via Hasofer-Lind iteration.

Finds the most probable point (MPP) on the limit-state surface g(u) = 0 in the standard normal space by iterative gradient projection.

Arguments

• n_dims - Number of standard normal input dimensions.
• g - Limit-state function: g(u) < 0 means failure.
• max_iter - Maximum number of HL-RF iterations.
• tol - Convergence tolerance on β.
• h - Finite-difference step for gradient.