{"id": "c910", "title": "C910 — State the common measurement-and-construction schema", "filename": "C910.md", "role": "Research action", "step": 910, "sha256": "d7f23bb8f6daf14aecff0dda604957e6350b3f21d6b176bd022b08e38b767cba", "bytes": 1184, "origins": ["C480–C1634/Research_Cycles/C0832_C0931/journal.json#C910"], "download": "/sources/d7f23bb8f6daf14aecff0dda604957e6350b3f21d6b176bd022b08e38b767cba.md", "format": "md", "derived": true, "tags": ["Regular", "Cumulative", "Rounded", "Inverse", "Covenant"], "excerpt": "How do the families fit together without erasing their source distinctions?", "content": "# C910 — State the common measurement-and-construction schema\n\n## Question\n\nHow do the families fit together without erasing their source distinctions?\n\n## Inputs\n\n```json\n{}\n```\n\n## Sources\n\n```json\n[\n  \"C831 baseline\",\n  \"C849,858,870,889,900,909\"\n]\n```\n\n## Opened utc\n\n2026-09-28T02:56:54.066194+00:00\n\n## Results\n\n```json\n{\n  \"schema\": {\n    \"path\": \"model/unified_family_schema.json\",\n    \"sha256\": \"39e20f67fe16cbacc00a3775111c47182d0a37065864794b2ffdd42d4a953691\",\n    \"bytes\": 1586\n  }\n}\n```\n\n## Finding\n\nThe larger picture is a shared measurement-and-construction grammar. Regular, cumulative, Rounded, list, NT, inverse, Key and Covenant families differ in the source structure or measurement they retain, while reusing a small set of explicit operations.\n\n## Reassessment\n\nCheckpoint80 actions, then make the explanation constructive and reader-facing.\n\n## Checks\n\n```json\n{\n  \"five_operations\": true,\n  \"six_source_fields\": true,\n  \"limits\": true\n}\n```\n\n## Closed utc\n\n2026-09-28T02:56:54.066578+00:00\n\n## Record provenance\n\nExact record hash: `d1719eab3ce62dccfc5ea61ccc45111f5aa6839e27701dea88272fc676668c8d`\n\nSource journal: `Research_Cycles/C0832_C0931/journal.json`", "journalDownload": "/sources/6a37be4e218f9f467cbde5e9db3723ce9c79dc78cc97d1a289422b96cb9971e0.json", "evidenceLinks": [{"id": "d-39e20f67fe16cbac", "title": "model/unified_family_schema.json"}]}