{"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-willowcreekbungalow-z1d6sc6b","versions":[{"created_at":"2026-06-13T19:16:59Z","element_count":90,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"cdc2abc8e292a0017674e41aaea69071f18118d7b9f9cbecbcedbd1cd82de582","version":3},{"created_at":"2026-06-13T19:09:31Z","element_count":107,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"714399229f27f9ac3c465a8423bdcb457b504ff57e0685634522bf5382f53f0e","version":2},{"created_at":"2026-06-13T19:09:27Z","element_count":107,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}