{"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-thewillowhouse-u0ieg6u9","versions":[{"created_at":"2026-06-10T13:22:53Z","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":"2026-06-10T10:37:17Z","element_count":85,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"ee10a885f4a6a6401ffb629efc934792eba5d1674274c35a58b2084812353928","version":2}]}