Function test_pow_well_below_one_signed_impl

tests/fl/math/fixed_point.cpp:5183–5188

// fire. Excludes u-types since their log2_fp doesn't support base < 1.0.
template <typename FP>
static void test_pow_well_below_one_signed_impl() {
    const FP half(0.5f);
    const FP two(2.0f);
    const FP one(1.0f);
    FL_CHECK(FP::pow(half, two).raw() < one.raw());
}

// For unsigned types: pow(2.0, 0.5) approx 1.414 -- well above 1.0, snap must NOT
// fire (it only triggers on base near 1.0, not on result).