{"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-9v9tafvt","versions":[{"created_at":"2026-06-13T20:29:20Z","element_count":71,"note":"5軸GA polish 44->96 by M5 (autonomous)","saved_by":"mcp","sha256":"2c6d80c1df82924d627b6c2a65c207e3389a2fff6617965da2be9f816c49f9a9","version":3},{"created_at":"2026-06-13T20:20:20Z","element_count":105,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"70358986f1f56443480c6a5866ba0a914b363829d0552c5cbd947c720b24d68a","version":2},{"created_at":"2026-06-13T20:20:20Z","element_count":105,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}