# C896 — Connect the complete carrier change to the typed115 hinge

## Question

What does the source115|115 symmetry explain and what remains a premise?

## Inputs

```json
{}
```

## Sources

```json
[
  "File63 §§7.7–7.9"
]
```

## Opened utc

2026-09-28T02:52:36.747989+00:00

## Results

```json
{
  "hinge": [
    2166,
    2051,
    1936
  ],
  "gaps": [
    115,
    115
  ],
  "carrier_total_change": 115,
  "artifact": {
    "path": "model/carrier_115_hinge.json",
    "sha256": "2e3792102917bad5494997444a37f55b4bf8e797d126cf6f176528f5ad8f77dc",
    "bytes": 337
  }
}
```

## Finding

The source2166→2051→1936 hinge supplies two115 intervals, and the full carrier path increases by115. This connects the objects structurally while retaining the proposed offering date and the regular/cumulative change of role.

## Reassessment

Reconstruct the complete144900 terminal Key branch and its gain vector.

## Checks

```json
{
  "equal_gaps": true,
  "carrier_change": true,
  "no_role_erasure": true
}
```

## Closed utc

2026-09-28T02:52:36.749098+00:00

## Record provenance

Exact record hash: `717d3cdd4336fd76ddeef13a0f41a61ff41608c9ac8e25be613a2487705b316d`

Source journal: `Research_Cycles/C0832_C0931/journal.json`