Function claim_weights 

pub fn claim_weights<F>(
    plan: &RingSwitchPlan,
    eta_tower: F,
    shifted_claims: bool,
) -> Vec<(bool, Block128)>
where
    F: HardwareField + Into<Block128>,

Per-claim weight a_c such that ring_target = Σ_c a_c · (ring ? φ_{r''}(c_c) : c_c), with φ_{r''}(x) = Σ_u eq(r'',u)·bit_u(x).