{"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-skpv45z2","versions":[{"created_at":"2026-06-13T21:01:30Z","element_count":84,"note":"5軸GA polish 42->94 by M5 (autonomous)","saved_by":"mcp","sha256":"5464d950333a17b99c34bc37637f908aef271c99bf8a7cc8fd586b87dc667f0b","version":3},{"created_at":"2026-06-13T20:47:03Z","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":"a41a1b0a0d9c94501ad933c132932cb912d62c837028ebfd8c12dfb585692b29","version":2},{"created_at":"2026-06-13T20:47:03Z","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}]}