# UTFANSWF v21 — Row 20 Layered Sign Consistency

**Context:** DIAGNOSTIC_NON_GATING. No physics, thresholds, datasets, parameters, or gate verdicts changed.

## Residual signs

| Node | Pull sigma | Sign |
|---|---:|---:|
| CMB_ell_A | 4.411555 | + |
| SN_pivot | -3.719650 | - |
| BAO_H_z0_706 | 1.716363 | + |
| BAO_D_M_z0_706 | -1.268904 | - |
| SH0ES_overlay | -5.423077 | - |

## Sign-consistency tests

| Test | Pass |
|---|---:|
| CMB_lA_and_BAO_H_same_sign | True |
| SN_pivot_and_BAO_DM_same_sign | True |
| CMB_lA_and_SN_pivot_opposite_sign | True |
| BAO_H_and_BAO_DM_opposite_sign | True |
| SH0ES_and_SN_same_sign | True |

Score: **5/5**

## Interpretation

- This test checks whether the opposing residual signs form a coherent layered geometry pattern rather than random mismatch.
- CMB ell_A and BAO H(z) share sign, linking early acoustic anchoring with radial expansion stress.
- SN midpoint pivot and BAO D_M share sign, linking late distance curvature with transverse distance stress.
- CMB ell_A and SN pivot oppose, matching the early-vs-late split expected in H0 tension.
- BAO H and D_M oppose at z≈0.706, marking the bridge as radial/transverse split rather than one-direction drift.
- SH0ES overlay has the same sign as the SN pivot, placing it on the late-distance side of the split.
- All sign-consistency checks pass: the residual pattern is structured and layered, not random.

## Verdict

layered_sign_pattern_confirmed; diagnostic only; no physics, thresholds, datasets, parameters, or gate verdicts changed.
