{"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-c749fmcm","versions":[{"created_at":"2026-06-19T19:26:50Z","element_count":90,"note":"5軸GA polish 44->95 by M5 (autonomous)","saved_by":"mcp","sha256":"cfd850fc4242d139c91c5d176709a9a2c006695a7ce7b565cf1ea13e25e0c2aa","version":3},{"created_at":"2026-06-19T19:23:43Z","element_count":86,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"05be4008b8108b3b8a7b2d513884f3226a4549dfa9cdeafb8a9ef377132baeae","version":2},{"created_at":"2026-06-19T19:23:41Z","element_count":86,"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}]}