Move the conformance oracle from chris-misa/maad 3ae7536 to b7bbb7d on
main, which includes the merged atomic-full-sortout branch and the
critical-region spectrum filter, keeping the local deltaQ = 1/8 patch.
Goldens are regenerated from the patched b7bbb7d oracle.

IPv4 structure is unchanged. Dimension rows are now ordered q = 0, 1, 2
and carry sd. The spectrum keeps only rows whose q lies in the critical
region, from min(0, min q <= 0 with f > 0) to max(1, max q >= 1 with
f > 0), and the alpha run is non-increasing (upstream a1 >= a2) rather
than strictly decreasing. Rust treats alphas within 1e-12 as ties. Stored
spectrum and dimension JSON change, so the MAAD contract version and the
Rust JSON schema version are bumped.