{"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-vrxq4wga","versions":[{"created_at":"2026-07-17T14:00:04Z","element_count":90,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"e303c2c8c57ef3878604d62110fb344308b0b93fb39a8479b3525e2e3f4912d8","version":3},{"created_at":"2026-07-17T13:56:14Z","element_count":107,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"55bd0c860454827e1338df1a395b80db85c8872e981af306b09dcb2f679093ff","version":2},{"created_at":"2026-07-17T13:56:14Z","element_count":107,"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}]}