{"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-sknkbejs","versions":[{"created_at":"2026-06-10T13:25:36Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積118.8㎡(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":"1057e54b4d4ed4f65c10338f415e2d2e21d2406091b509b6037bc6559b9b2523","version":11},{"created_at":"2026-06-10T11:10:00Z","element_count":74,"note":"5軸GA polish 56->95 by M5 (autonomous)","saved_by":"mcp","sha256":"fa37c48323aa87b999ad45a9fe7b95840ca6e2871cffb76ee5329d21f4e48e68","version":4}]}