{"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-walthamstowwillowhou-xgei6uex","versions":[{"created_at":"2026-06-10T13:22:27Z","element_count":66,"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":"bcb59d06516f685b7a57ccf1d94b0624ac566c420252e658c1051b161b05a445","version":10},{"created_at":"2026-06-10T10:23:27Z","element_count":73,"note":"5軸GA polish 43->96 by M5 (autonomous)","saved_by":"mcp","sha256":"7331673191d3337b7ee320b33217a31a40ba453321e4b8a0e558e40106a1e93e","version":2}]}