{"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-190t1od5","versions":[{"created_at":"2026-06-10T22:01:52Z","element_count":54,"note":"revert: houki rescan NG -> restore pre-polish elements (M5 2026-06-11)","saved_by":"mcp","sha256":"5824413f38d63ff06e727e3837d45bee251e5830fd992d9f9693561f76ac6363","version":5},{"created_at":"2026-06-10T18:29:58Z","element_count":72,"note":"5軸GA polish 60->96 by M5 (autonomous)","saved_by":"mcp","sha256":"390759e33e062e8d616f94a3695cc05003f31e166f5276239641a86128d62f6e","version":3}]}