Function sig_encode 

pub fn sig_encode<P: Params>(
    c_tilde: &[u8],
    z: &[[i32; 256]],
    h: &[[i32; 256]],
) -> Vec<u8> 

Encode a signature as bytes.

Implements Algorithm 26 of FIPS 204 (sigEncode). The signature is the concatenation of c_tilde (lambda/4 bytes), the l polynomials of z (each packed with 1 + bitlen(gamma1-1) bits per coefficient), and the hint vector h (packed via hint_bit_pack).

• c_tilde: commitment hash (lambda/4 bytes).
• z: response vector (l polynomials with coefficients in [-(gamma1-1), gamma1]).
• h: hint vector (k binary polynomials).

Returns a byte vector of length P::SIG_LEN.