{"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-alwoodleygrangehouse-53fhgaf6","versions":[{"created_at":"2026-06-10T13:19:56Z","element_count":63,"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":"218e6e6b86743c83e7a76cab7d429db87f29307f8e9f234ddd7d5518019c0330","version":10},{"created_at":"2026-06-10T10:23:14Z","element_count":85,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"93e608eab1196b72ae0e83d6009dd193e9aad14e6fbdaad32418262121208688","version":2}]}