{"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-n0xsp021","versions":[{"created_at":"2026-07-01T19:36:02Z","element_count":72,"note":"5軸GA polish 43->95 by M5 (autonomous)","saved_by":"mcp","sha256":"3998246f30ed017c851a46f2e2b5997ef56ea9f25bf7a67136dc71d65de30036","version":3},{"created_at":"2026-07-01T19:31:25Z","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":"8c803705f3593cb3336b8437c6a4a8d8997829ffe2f689efdc27a299180190bb","version":2},{"created_at":"2026-07-01T19:31:25Z","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}]}