{"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-fot0fr0p","versions":[{"created_at":"2026-06-11T01:56:47Z","element_count":72,"note":"5軸GA polish 43->97 by M5 (autonomous)","saved_by":"mcp","sha256":"ff8e8b1f537e6a670da743a341465500ef3066de3c4213e29fc1cf88b2116e78","version":5},{"created_at":"2026-06-11T00:34:15Z","element_count":46,"note":"loop3: 設計時延床 70.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"214a7adedb27be5acd0937fccaf0bf3f537a9d7e1f5e2bffa9f3438eff5bf092","version":2}]}