{"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-5n45ln52","versions":[{"created_at":"2026-07-13T10:09:57Z","element_count":85,"note":"5軸GA polish 42->95 by M5 (autonomous)","saved_by":"mcp","sha256":"4306c0665ce61fa74e0ba505a294244c2a20aa6864845bffad0714637e588a9c","version":3},{"created_at":"2026-07-13T09:52:42Z","element_count":119,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"c39faf80884b82ab301cd8a02139641b89d20f2783864677fe92ee3a2f32c77b","version":2},{"created_at":"2026-07-13T09:52:42Z","element_count":119,"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}]}