{"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-pzlfep6n","versions":[{"created_at":"2026-06-10T13:15:37Z","element_count":65,"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":"f249cafaa9e752fd2d91d1b55fab9195159214b60d61906b16f4245252fb7f90","version":10},{"created_at":"2026-06-10T09:38:04Z","element_count":85,"note":"5軸GA polish 53->98 by M5 (autonomous)","saved_by":"mcp","sha256":"9a111a96844f8a7e2222ef94f6da356f4b09af86654dac40de32db9b64b2b364","version":2}]}