{"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-eqi6yycl","versions":[{"created_at":"2026-06-10T13:27:01Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積81.4㎡(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":"ff2a49e0317cef56e20a2842c92724ea3d962725d7b54dd56e2bc3bff3865bf3","version":9},{"created_at":"2026-06-10T11:26:47Z","element_count":83,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"a4efeefd3ee84a9ff068c75b65a420a8a731c5fa94723d686506b535659aa7e9","version":3}]}