{"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-htw0m1ey","versions":[{"created_at":"2026-06-11T01:57:13Z","element_count":84,"note":"5軸GA polish 47->97 by M5 (autonomous)","saved_by":"mcp","sha256":"3d2ad55d855b6aca238d2a0e4e17c5c7c3944915f3576fe6fe5057d77b2ae9b4","version":6},{"created_at":"2026-06-11T00:19:44Z","element_count":47,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"35d82cef9bdbf6eecb8e83e768d4126bd5bf2abfaa3ed45e05c9de654a73ade9","version":2}]}