{"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-fairfieldhouse-tj8lmvu6","versions":[{"created_at":"2026-06-15T11:31:45Z","element_count":82,"note":"5軸GA polish 40->93 by M5 (autonomous)","saved_by":"mcp","sha256":"5797ce47e0a26fe3b5827344b029b39753eb8b12a774c3d23d1ab180a0137e1b","version":3},{"created_at":"2026-06-15T11:27:47Z","element_count":119,"note":"loop3: 設計時延床 78.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"cf3fcbaca440c56defb27a846f6f7692b3c81ded47f8e8135368aa1e5a8e1939","version":2},{"created_at":"2026-06-15T11:27:43Z","element_count":119,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}