Function is_voided_by 

pub fn is_voided_by(
    edges: &[NQuin],
    roots: &[u64],
    removed: u64,
    node: u64,
) -> bool

Root-node dependency: is node voided by removing the foundational support removed? True iff node occurs normally but becomes unreachable once removed is gone — “if food/ shelter is removed, all dependent rights and capacities are voided” (the deepest-absence rule).