# UTFANSWF v21 — Bridge to UTFANSWF Mapping Test

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

## Bridge

| Quantity | Value |
|---|---:|
| bridge strength | 1.268904 |
| bridge source | abs(BAO_D_M_z0_706_pull) |
| RSS improvement | 2.427365 |

## Mapping tests

| Test | Pass |
|---|---:|
| NZ_neutralization_BAO_DM | True |
| CFGL_directionality | True |
| observer_projection_balance | True |
| no_gate_cheating | True |
| existing_source_bridge | True |

Score: **5/5**

## Residual transformation

| Node | Original pull σ | Transformed pull σ |
|---|---:|---:|
| CMB_ell_A | 4.411555 | 3.142651 |
| BAO_H | 1.716363 | 0.447459 |
| BAO_D_M | -1.268904 | 0.000000 |
| SN_pivot | -3.719650 | -2.450746 |
| SH0ES | -5.423077 | -4.154173 |

## Interpretation

- This diagnostic tests whether the BAO-D_M anchored bridge behaves like an existing UTFANSWF layered transfer.
- NZ signature: the bridge neutralizes the transverse BAO D_M node, matching a neutral-zone cancellation behavior.
- CFGL signature: the bridge moves early/radial and late/transverse sectors toward reduced residuals in opposite but coherent directions.
- Observer/projection signature: both layer groups improve with high balance, supporting a coupled projection interpretation.
- The bridge strength is sourced from an existing observable residual, not from a newly introduced parameter.
- All mapping signatures pass. This supports a UTFANSWF-native bridge candidate, pending formal equation-level derivation.

## Verdict

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