{"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-v5tdw3jg","versions":[{"created_at":"2026-06-10T13:24:29Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積97.8㎡(基礎/屋外/ロフト除外)。設備数量/コスト過大の是正","saved_by":"mcp","sha256":"a2478581aff8dc92a75ae448d130ad79ff6ffe7eb66c35485b313da23e66360e","version":10},{"created_at":"2026-06-10T10:53:16Z","element_count":69,"note":"5軸GA polish 61->95 by M5 (autonomous)","saved_by":"mcp","sha256":"2f362b578e12fad83aa1cea9bf5d9b1017e59b735c3c1a6e9a8289b7e9ab075d","version":3}]}