`playground/cm31_ntt/src/cm31`: figure out why it doesn't work when

[recmo]

On 2025-08-29 in 2a57572 “Merge pull request #153 from worldfnd/px/refactor”:

figure out why it doesn't work when
v equals CF { a: RF { val: 53cd1db6 }, b: RF { val: 5ac2fbb3 } }

        }
    }

    #[test]
    fn test_sqrt() {
        // TODO: figure out why it doesn't work when
        // v equals CF { a: RF { val: 53cd1db6 }, b: RF { val: 5ac2fbb3 } }
        let mut rng = ChaCha8Rng::seed_from_u64(1);
        let v: CF = rng.r#gen();
        let v = v.reduce();
        let v2 = (v * v).reduce();
        let s = v2.try_sqrt().unwrap();

From playground/cm31_ntt/src/cm31.rs:504

[xrvdg]

CM31 NTT will be replaced with another implementation.