{"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-4u1tb7y7","versions":[{"created_at":"2026-07-13T10:37:34Z","element_count":90,"note":"5軸GA polish 40->94 by M5 (autonomous)","saved_by":"mcp","sha256":"424b994eac216b2fc992c2738d9de0705589b09682949ea9465d39a8a1eac11f","version":3},{"created_at":"2026-07-13T10:30:09Z","element_count":82,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"17462009d94f4e0aec8e31e9c5f7359fd5335f209e2cdf7d1acbe49a4a9d4b63","version":2},{"created_at":"2026-07-13T10:30:09Z","element_count":82,"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}]}