{"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-u255ltpk","versions":[{"created_at":"2026-06-16T19:39:20Z","element_count":70,"note":"5軸GA polish 39->91 by M5 (autonomous)","saved_by":"mcp","sha256":"49d69e214f0f77e5103a5968dc3a8546aa4f8215a7435db3a986663ca38681f8","version":3},{"created_at":"2026-06-16T19:28:45Z","element_count":101,"note":"loop3: 設計時延床 70.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"d32ca64c5d47cf26c3ea7bfc1ac6953d28acb8b3bee312597f57221a445abe0e","version":2},{"created_at":"2026-06-16T19:28:45Z","element_count":101,"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}]}