{"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-birchwoodbungalow-orvwtv9y","versions":[{"created_at":"2026-06-13T17:52:22Z","element_count":90,"note":"5軸GA polish 43->96 by M5 (autonomous)","saved_by":"mcp","sha256":"03874dbeb0369f2e4362995386e62a4d2153ba4cf6191955470f0ebc643ec0fd","version":3},{"created_at":"2026-06-13T17:34:58Z","element_count":88,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"c561ab57e4e5447dbe51cdac8b980d01d1ebeba77a2e9df5a014e57e51378575","version":2},{"created_at":"2026-06-13T17:34:57Z","element_count":88,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}