# UTFANSWF v23 — Final Hardening Closeout

Date: 2026-08-17

## Governing rule

This final pass touched only consequential UTFANSWF-specific steps that were underived, assumed, contradictory, proxy-diluted, or overclaimed. Established external mathematics/physics was not re-derived for its own sake. No acceptance threshold was relaxed to recover a PASS.

`main.tex` and `main.pdf` were not edited.

- `main.tex` SHA-256: `fd4fe7cf9a0d42e9a9a1def50d49c4a03d8fcd6772f857cc5a269e183986e34a`
- `main.pdf` SHA-256: `77b1fd720821e0398337a6a7fceed570dc50093534fe9b60795a1524e4a0cf54`

These hashes are identical to the final-hardening starting archive.

## Final hardening changes

1. **Seesaw mathematical closure**
   - Full 6x6 Majorana matrix is diagonalized at high precision for the declared benchmark slice.
   - The Schur-complement seesaw approximation, exact light/heavy spectrum, and heavy-light mixing are checked explicitly.
   - Flavor/Yukawa origin, CP phases, and the origin of the declared `M_R` spectrum remain OPEN.

2. **Corrected minimal-SUSY-SU(5) heavy thresholds**
   - Active threshold closure uses the corrected `H_C + X/Y + Sigma` beta weights.
   - Corrected relation: `C2 = -(1/(2*pi))*(24 L_X + 12 L_Sigma)`.
   - Frozen repair slice reproduces `M_HC=1.8700319287e16 GeV`, `M_X=M_Sigma=1.0831613303e16 GeV`, `alpha_U^-1=25.7910032280` with machine-level closure.
   - This remains a pinned low-energy closure diagnostic, not a blind electroweak prediction.
   - Top-Yukawa threshold extension remains OPEN because no non-fitted `tan(beta)` / MSSM Yukawa matching boundary is declared.

3. **Blind UV electromagnetic boundary**
   - The old primitive `alpha_U^-1=8*pi` Sigma-only near-fail is preserved as a historical incomplete-threshold diagnostic.
   - After the full threshold repair, a source-complete blind UV prediction is BLOCKED because independent `M_HC/M_U` and `M_X/M_U` boundary data are not fixed by the current UTFANSWF-native inputs.
   - Pinned threshold masses are not imported into the blind solve because they use low-energy `alpha_1`/`alpha_2` information.

4. **Fine-structure / GRIFFIN claim boundary**
   - The legitimate blind checkpoint `alpha^-1(0)=137.03735243` and post-mixed rung `137.00222764` remain preserved.
   - The preserved late GRIFFIN runners are mechanically identified as endpoint-calibrated reduced/incremental diagnostics (`A_PRE`, `A_POST` enter their handoff/slope construction).
   - Therefore they are not promoted to an independently reconstructed source-complete handoff.
   - Final 1/137 derivation remains OPEN.

5. **Row 20 cosmology hardening**
   - Removed the hand-entered CMB `1.022` acoustic calibration from the active physics. The acoustic scale now uses `l_A = pi D_M(z*) / r_s(z*)` directly.
   - The old `1.022` value is retained only as ignored legacy provenance. The derived `r_d/r_s(z*)` for the active slice is approximately `1.0233214562`.
   - BAO `D_M/H` is scored directly with the unmodified correlated covariance. The old residual-derived NZ/CFGL correction is historical diagnostic-only.
   - The official transformation `D_H/r_d = c/(H r_d)` and its local covariance Jacobian are explicit and round-trip checked.
   - The previous sweep-selected SN slope (`-4.63`) is no longer inserted into the theory vector. SN intercept and linear redshift slope are profiled by covariance-weighted GLS and two nuisance degrees of freedom are charged.
   - The shipped SN and 80-point GW files are stress/proxy datasets. They remain executable diagnostics but are excluded from the Critical observational denominator so proxy dof cannot dilute the Critical score.

## Final Row 20 verdict

Critical evidence blocks: `CMB + BAO_DV + BAO_DM_H`.

- `chi2 = 11.15730004481402`
- effective dof = `8`
- `chi2/dof = 1.3946625056017525`
- frozen acceptance ceiling = `1.25`
- **Verdict: FAIL**

This FAIL is retained. The threshold was not changed and stress/proxy data were not restored to rescue the score.

The July-2026 distributed H0 value `73.1342021175366 km/s/Mpc` remains a preserved post-release candidate record, not the active v23 derived H0. A new distributed H0 is OPEN until the BAO channel node is independently derived and all downstream quantities are recalculated.

## Final canonical verification

Command:

```bash
python -m harness.run_all_gates
```

Final expected process exit code: **1**, because a blocking gate fails.

Blocking failures:
- Row 20 — compressed cosmology fit — FAIL

Non-blocking propagated failure:
- Row 25 — stress registry — FAIL because its live CCG scope correctly consumes the Row 20 failure.

All other executed gates PASS at their declared scopes:
- 0, 0.1, 0.2, 0.3, 0.4
- 19
- 20.1, 20.4
- 21, 22, 23, 24
- 26, 27, 28, 29

Final verification wall time in this environment: approximately **15.01 s**.

Raw console log: `results/FINAL_CANONICAL_RUN_2026-08-17.log`.

## Stop rule

This hardening iteration stops here by design. The exposed Row 20 failure is a scientific boundary, not a software defect to be tuned away. Future work on that boundary must begin from an independently motivated cosmology/BAO derivation or genuinely improved data/model mapping, with thresholds frozen before testing.
