# C629 — Write the continuation checkpoint

## Question

What must the next session retain to continue the Strategy without repeating completed work?

## Inputs

```json
{
  "cycle": [
    532,
    631
  ],
  "substantive_record_through": 628,
  "proposed_next": 632
}
```

## Sources

```json
[
  "Completed journal; revised synthesis; frozen controls; NEXT_C632_PROPOSED.md"
]
```

## Opened utc

2026-09-28T00:47:11.405724+00:00

## Results

```json
{
  "checkpoint": {
    "path": "deliverables/490d_Research_Checkpoint_After_C631_20260928.md",
    "sha256": "08f2ebf3612acdfd2315ee8376642f442817755917b9ae219169ab60d4fb2d3b",
    "bytes": 6393
  },
  "final_draft_sha256": "3efec12f1991ff27df1b76899d7c4e3303122462f47a49007509324f2dff9597",
  "next_step": 632,
  "next_step_executed": false
}
```

## Finding

The checkpoint preserves the completed constructions, source costs, corrected terminology, exact state controls and next whole-family proposal. It distinguishes substantive completion from the final replay gate that follows.

## Reassessment

Run the pre-closure replay against all completed records and current sources.

## Checks

```json
{
  "primary_identity": true,
  "cycle_length": true,
  "bridge_unit": true
}
```

## Closed utc

2026-09-28T00:47:11.406289+00:00

## Record provenance

Exact record hash: `900d6b04ba47e4b4839cf3748da00a40f739eb02b41bb62c974f6f1401188d17`

Source journal: `Research_Cycles/C0532_C0631/journal.json`