{"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-qv6xvtbu","versions":[{"created_at":"2026-06-10T13:31:36Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積103.4㎡(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":"4114685168fb3ad8f16bb26e402357ee86e9b332be8185215f85b8efab8572bd","version":8},{"created_at":"2026-06-10T12:00:00Z","element_count":90,"note":"5軸GA polish 54->97 by M5 (autonomous)","saved_by":"mcp","sha256":"14c50fa3cb10c7a25be9b0488ee31f6d2b3a30d4991c3cedc8a2c8ff452b4e68","version":3}]}