{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-house-8e2qb8ra","versions":[{"created_at":"2026-06-10T22:57:29Z","element_count":65,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"40516cb45403af2877cbb0ad07bc6bd6053a8810d6af88ec4d5749317a9e7587","version":9},{"created_at":"2026-06-10T19:18:58Z","element_count":83,"note":"5軸GA polish 60->96 by M5 (autonomous)","saved_by":"mcp","sha256":"2088530c11177eef77f43d8c92c1c5c077f05577ee29339cc6e19d90e7dd452c","version":2}]}