{"id": "c851", "title": "C851 — Close the first twenty-step explanatory checkpoint", "filename": "C851.md", "role": "Research action", "step": 851, "sha256": "295ccefe9f36962ded9aa43ea0e08bb670fdf2f6ce3f3ad31f81c548790483a6", "bytes": 1079, "origins": ["C480–C1634/Research_Cycles/C0832_C0931/journal.json#C851"], "download": "/sources/295ccefe9f36962ded9aa43ea0e08bb670fdf2f6ce3f3ad31f81c548790483a6.md", "format": "md", "derived": true, "tags": [], "excerpt": "What did the complete list holdout add to the common grammar?", "content": "# C851 — Close the first twenty-step explanatory checkpoint\n\n## Question\n\nWhat did the complete list holdout add to the common grammar?\n\n## Inputs\n\n```json\n{}\n```\n\n## Sources\n\n```json\n[\n  \"C832–850\"\n]\n```\n\n## Opened utc\n\n2026-09-28T02:35:35.445034+00:00\n\n## Results\n\n```json\n{\n  \"checkpoint\": {\n    \"path\": \"deliverables/490d_Chronological_Families_Checkpoint_C851.md\",\n    \"sha256\": \"18816601d66beb94848c9353dd59c9d2cbc13c64b9fad842459de3a7d3e78369\",\n    \"bytes\": 1453\n  }\n}\n```\n\n## Finding\n\nThe first transfer succeeds with one explicit enrichment: category predicates and declared order remain attached to source rows. Equal totals are now traced to exact constraints rather than treated as interchangeable objects.\n\n## Reassessment\n\nReconstruct the full paired-anchor field from its original digit registers.\n\n## Checks\n\n```json\n{\n  \"twenty\": true\n}\n```\n\n## Closed utc\n\n2026-09-28T02:35:35.445486+00:00\n\n## Record provenance\n\nExact record hash: `05927a24dbc74d44248e1825e477182d508a0b89c5033bb517860bd66006b9aa`\n\nSource journal: `Research_Cycles/C0832_C0931/journal.json`", "journalDownload": "/sources/6a37be4e218f9f467cbde5e9db3723ce9c79dc78cc97d1a289422b96cb9971e0.json", "evidenceLinks": [{"id": "d-18816601d66beb94", "title": "deliverables/490d_Chronological_Families_Checkpoint_C851.md"}]}