{"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-kelrosshouse-4iwnsr28","versions":[{"created_at":"2026-07-20T14:30:00Z","element_count":82,"note":"5軸GA polish 38->93 by M5 (autonomous)","saved_by":"mcp","sha256":"3d676c2c1afe17c02e1d62590e1584e63f22c0cf2bff829be27553b2618259f9","version":3},{"created_at":"2026-07-20T14:19:47Z","element_count":86,"note":"loop3: 設計時延床 55.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"e4e396aa79b804625be2415527add9274abe66a9fb5aed306d30f619fe572ab7","version":2},{"created_at":"2026-07-20T14:19:46Z","element_count":86,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}