{"id": "c891", "title": "C891 — Checkpoint the partial-action explanation", "filename": "C891.md", "role": "Research action", "step": 891, "sha256": "fdbd0d60e5d2068da8edc5aea8fe758a5fd903c68ae1ff45e355071ddc644f29", "bytes": 1044, "origins": ["C480–C1634/Research_Cycles/C0832_C0931/journal.json#C891"], "download": "/sources/fdbd0d60e5d2068da8edc5aea8fe758a5fd903c68ae1ff45e355071ddc644f29.md", "format": "md", "derived": true, "tags": [], "excerpt": "What does the60-action prefix add to the Strategy model?", "content": "# C891 — Checkpoint the partial-action explanation\n\n## Question\n\nWhat does the60-action prefix add to the Strategy model?\n\n## Inputs\n\n```json\n{}\n```\n\n## Sources\n\n```json\n[\n  \"C832–890\"\n]\n```\n\n## Opened utc\n\n2026-09-28T02:51:11.748774+00:00\n\n## Results\n\n```json\n{\n  \"checkpoint\": {\n    \"path\": \"deliverables/490d_Chronological_Families_Checkpoint_C891.md\",\n    \"sha256\": \"9dd481ca60ab6312e0c0017f79d58d641e75060d7ed38f9d278a71da8c450469\",\n    \"bytes\": 1380\n  },\n  \"prefix\": 59\n}\n```\n\n## Finding\n\nThe Key family is now explained as exact partial action on declared grids and anchored paths. The next whole-family test can distinguish outer expansion from retention of an internal biography.\n\n## Reassessment\n\nReconstruct the complete six-row macrohead field.\n\n## Checks\n\n```json\n{\n  \"prefix59\": true,\n  \"last890\": true\n}\n```\n\n## Closed utc\n\n2026-09-28T02:51:11.749925+00:00\n\n## Record provenance\n\nExact record hash: `53dae8ddea2ab9d721f470ed91ede57a5406f773c2170dcb2a18293946f0034d`\n\nSource journal: `Research_Cycles/C0832_C0931/journal.json`", "journalDownload": "/sources/6a37be4e218f9f467cbde5e9db3723ce9c79dc78cc97d1a289422b96cb9971e0.json", "evidenceLinks": [{"id": "d-9dd481ca60ab6312", "title": "deliverables/490d_Chronological_Families_Checkpoint_C891.md"}]}