# C871 — Checkpoint the complete new display transfer

## Question

What has the cycle established after40 actions?

## Inputs

```json
{
  "completed_before_checkpoint": 39
}
```

## Sources

```json
[
  "C832–870"
]
```

## Opened utc

2026-09-28T02:45:48.768904+00:00

## Results

```json
{
  "checkpoint": {
    "path": "deliverables/490d_Chronological_Families_Checkpoint_C871.md",
    "sha256": "c60360eafabad58481459cfa629adae3c322cc83c4481f8f717e2afc19f11a56",
    "bytes": 1328
  },
  "prefix_actions": 39
}
```

## Finding

The complete NT family transfers to the same ordered-path and measurement grammar. Its new contribution is whole-field reconstruction, finite lattice classification and common coarsening, not additional isolated dates.

## Reassessment

Freeze the complete operator packet and derive the general grid-preservation condition.

## Checks

```json
{
  "prefix": true,
  "last": true
}
```

## Closed utc

2026-09-28T02:45:48.769977+00:00

## Record provenance

Exact record hash: `2e4adc20288ce5a8932e53a74d37a709dd41e8fefd6745fbb7aa62d049e61173`

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