{"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-a1f1o0o0","versions":[{"created_at":"2026-06-26T06:28:48Z","element_count":83,"note":"5軸GA polish 45->96 by M5 (autonomous)","saved_by":"mcp","sha256":"8aa382e691d90ce39844d3f688a212d07e3aead685e06d1e0f961f3e8b36059e","version":3},{"created_at":"2026-06-26T06:15:32Z","element_count":88,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"74a0f9376142e4a56dd046039ee056cebe896a5c4d8e042e46e24f307d685713","version":2},{"created_at":"2026-06-26T06:15:32Z","element_count":88,"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}]}