Soft Wall Lifting Reopens the Entrance Source
The sector parity cannot simultaneously protect exact up/down alignment and explicitly lift the degenerate vacua produced by a nonzero odd entrance vev. Every protecting source operator is parity even and preserves the degeneracy; every splitting operator is parity odd and removes the exact selection rule.
The minimal gauge-invariant soft bilinear vanishes on the declared orthogonal vacuum pair, so its energy split there is zero. Its overlap-direction gradient is nevertheless its nonzero coefficient, destroying exact stationarity. It is therefore not a harmless wall eraser.
Honest successors must supply cosmological domain selection, gauge the parity in a changed physical groupoid, or add an odd source reference and recompute the complete vacuum and kinetic/Yukawa system.
Evidence: research/flavor/flavor-sector-parity-wall-lift-no-go.md and
research/flavor/results/wp630_sector_parity_wall_lift_no_go.json.