{"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-hilltophavenhouse-7xtfkh6d","versions":[{"created_at":"2026-06-13T19:03:56Z","element_count":72,"note":"5軸GA polish 44->97 by M5 (autonomous)","saved_by":"mcp","sha256":"045e7f61f45bc08a06ba179ee0246d100bf95846254c0bd13a22fb5a6d46a667","version":3},{"created_at":"2026-06-13T18:48:43Z","element_count":86,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"c93c41e733b12b502085f28b59c5f511f1a9d02c5144a4dcffacae4741f7a765","version":2},{"created_at":"2026-06-13T18:48:40Z","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}]}