# Row 28 — Proton Stability Z6 Candidate Integration

Status: PRIVATE_RESEARCH. This file documents executable/reproducibility integration only.
`main.tex` and `main.pdf` are intentionally untouched.

## Candidate chain

`Ngen=3 -> anomaly-free U(1)_X -> residual gauged Z6 -> DeltaB = 3k`.

Row 28 checks:

- parent U(1)_X anomaly cancellation,
- required Yukawa/seesaw/MSSM operators,
- exclusion of dangerous DeltaB=1,2 operators,
- electroweak-symmetry-breaking-safe residual representative,
- rank-3/rank-2 split projector and exact SM centralizer dimension,
- frozen spectral ratio `MSigma/Lambda_split = sqrt(2)/5`,
- protected two-loop unification compatibility,
- separate blind primitive `alphaU^-1=8*pi` holdout diagnostic.

The protected proton-stability gate is not allowed to erase the independent UV alpha-boundary miss.
No trinucleon lifetime is predicted because the DeltaB=3 Wilson coefficient/scale is not fixed.
