{"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-pal9yrwc","versions":[{"created_at":"2026-06-20T19:55:52Z","element_count":85,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"1584f5a38c1a22e8cd83cdfbef645d1c6bc28a8e7d24ee0d87707f6a676e09b2","version":3},{"created_at":"2026-06-20T19:42:48Z","element_count":90,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"ad3c48e62a14eea6d290083a3f223fa17f3336696b3588cd861ea582f0289736","version":2},{"created_at":"2026-06-20T19:42:48Z","element_count":90,"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}]}