{"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-sle1jdfr","versions":[{"created_at":"2026-06-11T03:31:07Z","element_count":83,"note":"5軸GA polish 44->94 by M5 (autonomous)","saved_by":"mcp","sha256":"ce56f9d24f9ce938200580348d301671e30f7191dbd4881855de5638dd827c08","version":3},{"created_at":"2026-06-11T03:28:23Z","element_count":101,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"cb44cfe1a3df7be51897b7043108aab795205ab7819e23b607f5aadb4f055eb3","version":2}]}