{"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-pineclosecottage-dy9g21mh","versions":[{"created_at":"2026-06-10T13:19:35Z","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":10},{"created_at":"2026-06-10T10:09:07Z","element_count":84,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"a9612a6984f595a410f6dc9818d7351282e16b2200ed3985ef297b0328d85175","version":2}]}